TLS authenticator

[users/jgh/exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 0775cb1395d8190e74d7b695f68cde9ffcddcd8f..4e561f2b9571a0b050f54ce6c613fd29ce887dc5 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -45,7 +45,7 @@
 . Update the Copyright year (only) when changing content.
 . /////////////////////////////////////////////////////////////////////////////
 
 . Update the Copyright year (only) when changing content.
 . /////////////////////////////////////////////////////////////////////////////
 

-.set previousversion "4.83"
+.set previousversion "4.85"

 .include ./local_params
 
 .set ACL "access control lists (ACLs)"
 .include ./local_params
 
 .set ACL "access control lists (ACLs)"


@@ -1985,10 +1985,9 @@ Two different types of DNS record for handling IPv6 addresses have been
 defined. AAAA records (analogous to A records for IPv4) are in use, and are
 currently seen as the mainstream. Another record type called A6 was proposed
 as better than AAAA because it had more flexibility. However, it was felt to be
 defined. AAAA records (analogous to A records for IPv4) are in use, and are
 currently seen as the mainstream. Another record type called A6 was proposed
 as better than AAAA because it had more flexibility. However, it was felt to be

-over-complex, and its status was reduced to &"experimental"&. It is not known
-if anyone is actually using A6 records. Exim has support for A6 records, but
-this is included only if you set &`SUPPORT_A6=YES`& in &_Local/Makefile_&. The
-support has not been tested for some time.
+over-complex, and its status was reduced to &"experimental"&. Exim used to
+have a compile option for including A6 record support but this has now been
+withdrawn.

 
 
 
 
 
 


@@ -3811,6 +3810,14 @@ This option is not intended for use by external callers. It is used internally
 by Exim in conjunction with the &%-MC%& option. It signifies that the
 connection to the remote host has been authenticated.
 
 by Exim in conjunction with the &%-MC%& option. It signifies that the
 connection to the remote host has been authenticated.
 

+.new
+.vitem &%-MCD%&
+.oindex "&%-MCD%&"
+This option is not intended for use by external callers. It is used internally
+by Exim in conjunction with the &%-MC%& option. It signifies that the
+remote host supports the ESMTP &_DSN_& extension.
+.wen
+

 .vitem &%-MCP%&
 .oindex "&%-MCP%&"
 This option is not intended for use by external callers. It is used internally
 .vitem &%-MCP%&
 .oindex "&%-MCP%&"
 This option is not intended for use by external callers. It is used internally


@@ -4640,6 +4647,13 @@ this option.
 .oindex "&%-X%&"
 This option is interpreted by Sendmail to cause debug information to be sent
 to the named file.  It is ignored by Exim.
 .oindex "&%-X%&"
 This option is interpreted by Sendmail to cause debug information to be sent
 to the named file.  It is ignored by Exim.

+
+.vitem &%-z%&&~<&'log-line'&>
+.oindex "&%-z%&"
+This option writes its argument to Exim's logfile.
+Use is restricted to administrators; the intent is for operational notes.
+Quotes should be used to maintain a multi-word item as a single argument,
+under most shells.

 .endlist
 
 .ecindex IIDclo1
 .endlist
 
 .ecindex IIDclo1


@@ -5567,7 +5581,7 @@ of an incoming SMTP connection.
 If you have hosts for which you trust RFC1413 and need this
 information, you can change this.
 
 If you have hosts for which you trust RFC1413 and need this
 information, you can change this.
 

-This line enables an efficiency SMTP option.  It is negociated by clients
+This line enables an efficiency SMTP option.  It is negotiated by clients

 and not expected to cause problems but can be disabled if needed.
 .code
 prdr_enable = true
 and not expected to cause problems but can be disabled if needed.
 .code
 prdr_enable = true


@@ -6864,9 +6878,26 @@ is used on its own as the result. If the lookup does not succeed, the
 &`fail`& keyword causes a &'forced expansion failure'& &-- see section
 &<<SECTforexpfai>>& for an explanation of what this means.
 
 &`fail`& keyword causes a &'forced expansion failure'& &-- see section
 &<<SECTforexpfai>>& for an explanation of what this means.
 

-The supported DNS record types are A, CNAME, MX, NS, PTR, SPF, SRV, TLSA and TXT,
-and, when Exim is compiled with IPv6 support, AAAA (and A6 if that is also
-configured). If no type is given, TXT is assumed. When the type is PTR,
+The supported DNS record types are A, CNAME, MX, NS, PTR, SOA, SPF, SRV, TLSA
+and TXT, and, when Exim is compiled with IPv6 support, AAAA.
+If no type is given, TXT is assumed.
+
+For any record type, if multiple records are found, the data is returned as a
+concatenation, with newline as the default separator. The order, of course,
+depends on the DNS resolver. You can specify a different separator character
+between multiple records by putting a right angle-bracket followed immediately
+by the new separator at the start of the query. For example:
+.code
+${lookup dnsdb{>: a=host1.example}}
+.endd
+It is permitted to specify a space as the separator character. Further
+white space is ignored.
+For lookup types that return multiple fields per record,
+an alternate field separator can be specified using a comma after the main
+separator character, followed immediately by the field separator.
+
+.cindex "PTR record" "in &(dnsdb)& lookup"
+When the type is PTR,

 the data can be an IP address, written as normal; inversion and the addition of
 &%in-addr.arpa%& or &%ip6.arpa%& happens automatically. For example:
 .code
 the data can be an IP address, written as normal; inversion and the addition of
 &%in-addr.arpa%& or &%ip6.arpa%& happens automatically. For example:
 .code


@@ -6880,25 +6911,14 @@ altered and nothing is added.
 For an MX lookup, both the preference value and the host name are returned for
 each record, separated by a space. For an SRV lookup, the priority, weight,
 port, and host name are returned for each record, separated by spaces.
 For an MX lookup, both the preference value and the host name are returned for
 each record, separated by a space. For an SRV lookup, the priority, weight,
 port, and host name are returned for each record, separated by spaces.

-
-For any record type, if multiple records are found (or, for A6 lookups, if a
-single record leads to multiple addresses), the data is returned as a
-concatenation, with newline as the default separator. The order, of course,
-depends on the DNS resolver. You can specify a different separator character
-between multiple records by putting a right angle-bracket followed immediately
-by the new separator at the start of the query. For example:
-.code
-${lookup dnsdb{>: a=host1.example}}
-.endd
-It is permitted to specify a space as the separator character. Further
-white space is ignored.
+The field separator can be modified as above.

 
 .cindex "TXT record" "in &(dnsdb)& lookup"
 .cindex "SPF record" "in &(dnsdb)& lookup"
 For TXT records with multiple items of data, only the first item is returned,
 
 .cindex "TXT record" "in &(dnsdb)& lookup"
 .cindex "SPF record" "in &(dnsdb)& lookup"
 For TXT records with multiple items of data, only the first item is returned,

-unless a separator for them is specified using a comma after the separator
-character followed immediately by the TXT record item separator. To concatenate
-items without a separator, use a semicolon instead. For SPF records the
+unless a field separator is specified.
+To concatenate items without a separator, use a semicolon instead.
+For SPF records the

 default behaviour is to concatenate multiple items without using a separator.
 .code
 ${lookup dnsdb{>\n,: txt=a.b.example}}
 default behaviour is to concatenate multiple items without using a separator.
 .code
 ${lookup dnsdb{>\n,: txt=a.b.example}}


@@ -6908,6 +6928,66 @@ ${lookup dnsdb{spf=example.org}}
 It is permitted to specify a space as the separator character. Further
 white space is ignored.
 
 It is permitted to specify a space as the separator character. Further
 white space is ignored.
 

+.cindex "SOA record" "in &(dnsdb)& lookup"
+For an SOA lookup, while no result is obtained the lookup is redone with
+successively more leading components dropped from the given domain.
+Only the primary-nameserver field is returned unless a field separator is
+specified.
+.code
+${lookup dnsdb{>:,; soa=a.b.example.com}}
+.endd
+
+.section "Dnsdb lookup modifiers" "SECTdnsdb_mod"
+.cindex "dnsdb modifiers"
+.cindex "modifiers" "dnsdb"
+.cindex "options" "dnsdb"
+Modifiers for &(dnsdb)& lookups are givien by optional keywords,
+each followed by a comma,
+that may appear before the record type.
+
+The &(dnsdb)& lookup fails only if all the DNS lookups fail. If there is a
+temporary DNS error for any of them, the behaviour is controlled by
+a defer-option modifier.
+The possible keywords are
+&"defer_strict"&, &"defer_never"&, and &"defer_lax"&.
+With &"strict"& behaviour, any temporary DNS error causes the
+whole lookup to defer. With &"never"& behaviour, a temporary DNS error is
+ignored, and the behaviour is as if the DNS lookup failed to find anything.
+With &"lax"& behaviour, all the queries are attempted, but a temporary DNS
+error causes the whole lookup to defer only if none of the other lookups
+succeed. The default is &"lax"&, so the following lookups are equivalent:
+.code
+${lookup dnsdb{defer_lax,a=one.host.com:two.host.com}}
+${lookup dnsdb{a=one.host.com:two.host.com}}
+.endd
+Thus, in the default case, as long as at least one of the DNS lookups
+yields some data, the lookup succeeds.
+
+.cindex "DNSSEC" "dns lookup"
+Use of &(DNSSEC)& is controlled by a dnssec modifier.
+The possible keywords are
+&"dnssec_strict"&, &"dnssec_lax"&, and &"dnssec_never"&.
+With &"strict"& or &"lax"& DNSSEC information is requested
+with the lookup.
+With &"strict"& a response from the DNS resolver that
+is not labelled as authenticated data
+is treated as equivalent to a temporary DNS error.
+The default is &"never"&.
+
+See also the &$lookup_dnssec_authenticated$& variable.
+
+.cindex timeout "dns lookup"
+.cindex "DNS" timeout
+Timeout for the dnsdb lookup can be controlled by a retrans modifier.
+The form is &"retrans_VAL"& where VAL is an Exim time specification
+(eg &"5s"&).
+The default value is set by the main configuration option &%dns_retrans%&.
+
+Retries for the dnsdb lookup can be controlled by a retry modifier.
+The form if &"retry_VAL"& where VAL is an integer.
+The default count is set by the main configuration option &%dns_retry%&.
+
+

 .section "Pseudo dnsdb record types" "SECID66"
 .cindex "MX record" "in &(dnsdb)& lookup"
 By default, both the preference value and the host name are returned for
 .section "Pseudo dnsdb record types" "SECID66"
 .cindex "MX record" "in &(dnsdb)& lookup"
 By default, both the preference value and the host name are returned for


@@ -6956,7 +7036,7 @@ The authorization code can be &"Y"& for yes, &"N"& for no, &"X"& for explicit
 authorization required but absent, or &"?"& for unknown.
 
 .cindex "A+" "in &(dnsdb)& lookup"
 authorization required but absent, or &"?"& for unknown.
 
 .cindex "A+" "in &(dnsdb)& lookup"

-The pseudo-type A+ performs an A6 lookup (if configured) followed by an AAAA
+The pseudo-type A+ performs an AAAA

 and then an A lookup.  All results are returned; defer processing
 (see below) is handled separately for each lookup.  Example:
 .code
 and then an A lookup.  All results are returned; defer processing
 (see below) is handled separately for each lookup.  Example:
 .code


@@ -6983,41 +7063,6 @@ The data from each lookup is concatenated, with newline separators by default,
 in the same way that multiple DNS records for a single item are handled. A
 different separator can be specified, as described above.
 
 in the same way that multiple DNS records for a single item are handled. A
 different separator can be specified, as described above.
 

-Modifiers for &(dnsdb)& lookups are givien by optional keywords,
-each followed by a comma,
-that may appear before the record type.
-
-The &(dnsdb)& lookup fails only if all the DNS lookups fail. If there is a
-temporary DNS error for any of them, the behaviour is controlled by
-a defer-option modifier.
-The possible keywords are
-&"defer_strict"&, &"defer_never"&, and &"defer_lax"&.
-With &"strict"& behaviour, any temporary DNS error causes the
-whole lookup to defer. With &"never"& behaviour, a temporary DNS error is
-ignored, and the behaviour is as if the DNS lookup failed to find anything.
-With &"lax"& behaviour, all the queries are attempted, but a temporary DNS
-error causes the whole lookup to defer only if none of the other lookups
-succeed. The default is &"lax"&, so the following lookups are equivalent:
-.code
-${lookup dnsdb{defer_lax,a=one.host.com:two.host.com}}
-${lookup dnsdb{a=one.host.com:two.host.com}}
-.endd
-Thus, in the default case, as long as at least one of the DNS lookups
-yields some data, the lookup succeeds.
-
-.cindex "DNSSEC" "dns lookup"
-Use of &(DNSSEC)& is controlled by a dnssec modifier.
-The possible keywords are
-&"dnssec_strict"&, &"dnssec_lax"&, and &"dnssec_never"&.
-With &"strict"& or &"lax"& DNSSEC information is requested
-with the lookup.
-With &"strict"& a response from the DNS resolver that
-is not labelled as authenticated data
-is treated as equivalent to a temporary DNS error.
-The default is &"never"&.
-
-See also the &$lookup_dnssec_authenticated$& variable.
-

 
 
 
 
 
 


@@ -7338,30 +7383,38 @@ If you specify multiple attributes, the result contains space-separated, quoted
 strings, each preceded by the attribute name and an equals sign. Within the
 quotes, the quote character, backslash, and newline are escaped with
 backslashes, and commas are used to separate multiple values for the attribute.
 strings, each preceded by the attribute name and an equals sign. Within the
 quotes, the quote character, backslash, and newline are escaped with
 backslashes, and commas are used to separate multiple values for the attribute.

+Any commas in attribute values are doubled
+(permitting treatment of the values as a comma-separated list).

 Apart from the escaping, the string within quotes takes the same form as the
 output when a single attribute is requested. Specifying no attributes is the
 same as specifying all of an entry's attributes.
 
 Here are some examples of the output format. The first line of each pair is an
 LDAP query, and the second is the data that is returned. The attribute called
 Apart from the escaping, the string within quotes takes the same form as the
 output when a single attribute is requested. Specifying no attributes is the
 same as specifying all of an entry's attributes.
 
 Here are some examples of the output format. The first line of each pair is an
 LDAP query, and the second is the data that is returned. The attribute called

-&%attr1%& has two values, whereas &%attr2%& has only one value:
+&%attr1%& has two values, one of them with an embedded comma, whereas
+&%attr2%& has only one value:

 .code
 ldap:///o=base?attr1?sub?(uid=fred)
 .code
 ldap:///o=base?attr1?sub?(uid=fred)

-value1.1, value1.2
+value1.1,value1,,2

 
 ldap:///o=base?attr2?sub?(uid=fred)
 value two
 
 ldap:///o=base?attr1,attr2?sub?(uid=fred)
 
 ldap:///o=base?attr2?sub?(uid=fred)
 value two
 
 ldap:///o=base?attr1,attr2?sub?(uid=fred)

-attr1="value1.1, value1.2" attr2="value two"
+attr1="value1.1,value1,,2" attr2="value two"

 
 ldap:///o=base??sub?(uid=fred)
 
 ldap:///o=base??sub?(uid=fred)

-objectClass="top" attr1="value1.1, value1.2" attr2="value two"
+objectClass="top" attr1="value1.1,value1,,2" attr2="value two"

 .endd
 .endd

-The &%extract%& operator in string expansions can be used to pick out
-individual fields from data that consists of &'key'&=&'value'& pairs. You can
+You can

 make use of Exim's &%-be%& option to run expansion tests and thereby check the
 results of LDAP lookups.
 make use of Exim's &%-be%& option to run expansion tests and thereby check the
 results of LDAP lookups.

+The &%extract%& operator in string expansions can be used to pick out
+individual fields from data that consists of &'key'&=&'value'& pairs.
+The &%listextract%& operator should be used to pick out individual values
+of attributes, even when only a single value is expected.
+The doubling of embedded commas allows you to use the returned data as a
+comma separated list (using the "<," syntax for changing the input list separator).

 
 
 
 
 
 


@@ -8912,7 +8965,7 @@ The field selectors marked as "RFC4514" above
 output a Distinguished Name string which is
 not quite
 parseable by Exim as a comma-separated tagged list
 output a Distinguished Name string which is
 not quite
 parseable by Exim as a comma-separated tagged list

-(the exceptions being elements containin commas).
+(the exceptions being elements containing commas).

 RDN elements of a single type may be selected by
 a modifier of the type label; if so the expansion
 result is a list (newline-separated by default).
 RDN elements of a single type may be selected by
 a modifier of the type label; if so the expansion
 result is a list (newline-separated by default).


@@ -8921,8 +8974,10 @@ a right angle-bracket followed immediately by the new separator.
 Recognised RDN type labels include "CN", "O", "OU" and "DC".
 
 The field selectors marked as "time" above
 Recognised RDN type labels include "CN", "O", "OU" and "DC".
 
 The field selectors marked as "time" above

-may output a number of seconds since epoch
-if the modifier "int" is used.
+take an optional modifier of "int"
+for which the result is the number of seconds since epoch.
+Otherwise the result is a human-readable string
+in the timezone selected by the main "timezone" option.

 
 The field selectors marked as "list" above return a list,
 newline-separated by default,
 
 The field selectors marked as "list" above return a list,
 newline-separated by default,


@@ -8976,6 +9031,30 @@ When compiling a function that is to be used in this way with gcc,
 you need to add &%-shared%& to the gcc command. Also, in the Exim build-time
 configuration, you must add &%-export-dynamic%& to EXTRALIBS.
 
 you need to add &%-shared%& to the gcc command. Also, in the Exim build-time
 configuration, you must add &%-export-dynamic%& to EXTRALIBS.
 

+
+.vitem "&*${env{*&<&'key'&>&*}{*&<&'string1'&>&*}{*&<&'string2'&>&*}}*&"
+.cindex "expansion" "extracting value from environment"
+.cindex "environment" "value from"
+The key is first expanded separately, and leading and trailing white space
+removed.
+This is then searched for as a name in the environment.
+If a variable is found then its value is placed in &$value$&
+and <&'string1'&> is expanded, otherwise <&'string2'&> is expanded.
+
+Instead of {<&'string2'&>} the word &"fail"& (not in curly brackets) can
+appear, for example:
+.code
+${env{USER}{$value} fail }
+.endd
+This forces an expansion failure (see section &<<SECTforexpfai>>&);
+{<&'string1'&>} must be present for &"fail"& to be recognized.
+
+If {<&'string2'&>} is omitted an empty string is substituted on 
+search failure.
+If {<&'string1'&>} is omitted the search result is substituted on
+search success.
+
+

 .vitem "&*${extract{*&<&'key'&>&*}{*&<&'string1'&>&*}{*&<&'string2'&>&*}&&&
        {*&<&'string3'&>&*}}*&"
 .cindex "expansion" "extracting substrings by key"
 .vitem "&*${extract{*&<&'key'&>&*}{*&<&'string1'&>&*}{*&<&'string2'&>&*}&&&
        {*&<&'string3'&>&*}}*&"
 .cindex "expansion" "extracting substrings by key"


@@ -9489,7 +9568,7 @@ locks out the use of this expansion item in filter files.
 .cindex "expansion" "inserting from a socket"
 .cindex "socket, use of in expansion"
 .cindex "&%readsocket%& expansion item"
 .cindex "expansion" "inserting from a socket"
 .cindex "socket, use of in expansion"
 .cindex "&%readsocket%& expansion item"

-This item inserts data from a Unix domain or Internet socket into the expanded
+This item inserts data from a Unix domain or TCP socket into the expanded

 string. The minimal way of using it uses just two arguments, as in these
 examples:
 .code
 string. The minimal way of using it uses just two arguments, as in these
 examples:
 .code


@@ -9680,6 +9759,36 @@ the regular expression from string expansion.
 
 
 
 
 
 

+.vitem &*${sort{*&<&'string'&>&*}{*&<&'comparator'&>&*}{*&<&'extractor'&>&*}}*&
+.cindex sorting "a list"
+.cindex list sorting
+.cindex expansion "list sorting"
+After expansion, <&'string'&> is interpreted as a list, colon-separated by
+default, but the separator can be changed in the usual way.
+The <&'comparator'&> argument is interpreted as the operator
+of a two-argument expansion condition.
+The numeric operators plus ge, gt, le, lt (and ~i variants) are supported.
+The comparison should return true when applied to two values
+if the first value should sort before the second value.
+The <&'extractor'&> expansion is applied repeatedly to elements of the list,
+the element being placed in &$item$&,
+to give values for comparison.
+
+The item result is a sorted list,
+with the original list separator,
+of the list elements (in full) of the original.
+
+Examples:
+.code
+${sort{3:2:1:4}{<}{$item}}
+.endd
+sorts a list of numbers, and
+.code
+${sort {${lookup dnsdb{>:,,mx=example.com}}} {<} {${listextract{1}{<,$item}}}}
+.endd
+will sort an MX lookup into priority order.
+
+

 .vitem &*${substr{*&<&'string1'&>&*}{*&<&'string2'&>&*}{*&<&'string3'&>&*}}*&
 .cindex "&%substr%& expansion item"
 .cindex "substring extraction"
 .vitem &*${substr{*&<&'string1'&>&*}{*&<&'string2'&>&*}{*&<&'string3'&>&*}}*&
 .cindex "&%substr%& expansion item"
 .cindex "substring extraction"


@@ -11208,6 +11317,19 @@ The building process for Exim keeps a count of the number
 of times it has been compiled. This serves to distinguish different
 compilations of the same version of the program.
 
 of times it has been compiled. This serves to distinguish different
 compilations of the same version of the program.
 

+.new
+.vitem &$config_dir$&
+.vindex "&$config_dir$&"
+The directory name of the main configuration file. That is, the content of
+&$config_file$& with the last component stripped. The value does not
+contain the trailing slash. If &$config_file$& does not contain a slash,
+&$config_dir$& is ".".
+
+.vitem &$config_file$&
+.vindex "&$config_file$&"
+The name of the main configuration file Exim is using.
+.wen
+

 .vitem &$demime_errorlevel$&
 .vindex "&$demime_errorlevel$&"
 This variable is available when Exim is compiled with
 .vitem &$demime_errorlevel$&
 .vindex "&$demime_errorlevel$&"
 This variable is available when Exim is compiled with


@@ -11315,6 +11437,15 @@ This variable contains the path to the Exim binary.
 .vindex "&$exim_uid$&"
 This variable contains the numerical value of the Exim user id.
 
 .vindex "&$exim_uid$&"
 This variable contains the numerical value of the Exim user id.
 

+.new
+.vitem &$exim_version$&
+.vindex "&$exim_version$&"
+This variable contains the version string of the Exim build.
+The first character is a major version number, currently 4.
+Then after a dot, the next group of digits is a minor version number.
+There may be other characters following the minor version.
+.wen
+

 .vitem &$found_extension$&
 .vindex "&$found_extension$&"
 This variable is available when Exim is compiled with the
 .vitem &$found_extension$&
 .vindex "&$found_extension$&"
 This variable is available when Exim is compiled with the


@@ -11574,6 +11705,7 @@ the space value is -1. See also the &%check_log_space%& option.
 .vindex "&$lookup_dnssec_authenticated$&"
 This variable is set after a DNS lookup done by
 a dnsdb lookup expansion, dnslookup router or smtp transport.
 .vindex "&$lookup_dnssec_authenticated$&"
 This variable is set after a DNS lookup done by
 a dnsdb lookup expansion, dnslookup router or smtp transport.

+.cindex "DNS" "DNSSEC"

 It will be empty if &(DNSSEC)& was not requested,
 &"no"& if the result was not labelled as authenticated data
 and &"yes"& if it was.
 It will be empty if &(DNSSEC)& was not requested,
 &"no"& if the result was not labelled as authenticated data
 and &"yes"& if it was.


@@ -11664,7 +11796,7 @@ This variable is like &$message_headers$& except that no processing of the
 contents of header lines is done.
 
 .vitem &$message_id$&
 contents of header lines is done.
 
 .vitem &$message_id$&

-This is an old name for &$message_exim_id$&, which is now deprecated.
+This is an old name for &$message_exim_id$&. It is now deprecated.

 
 .vitem &$message_linecount$&
 .vindex "&$message_linecount$&"
 
 .vitem &$message_linecount$&
 .vindex "&$message_linecount$&"


@@ -11881,10 +12013,7 @@ on which interface and/or port is being used for the incoming connection. The
 values of &$received_ip_address$& and &$received_port$& are saved with any
 messages that are received, thus making these variables available at delivery
 time.
 values of &$received_ip_address$& and &$received_port$& are saved with any
 messages that are received, thus making these variables available at delivery
 time.

-
-&*Note:*& There are no equivalent variables for outgoing connections, because
-the values are unknown (unless they are explicitly set by options of the
-&(smtp)& transport).
+For outbound connections see &$sending_ip_address$&.

 
 .vitem &$received_port$&
 .vindex "&$received_port$&"
 
 .vitem &$received_port$&
 .vindex "&$received_port$&"


@@ -12094,6 +12223,14 @@ verification either failed or was not requested. A host name in parentheses is
 the argument of a HELO or EHLO command. This is omitted if it is identical to
 the verified host name or to the host's IP address in square brackets.
 
 the argument of a HELO or EHLO command. This is omitted if it is identical to
 the verified host name or to the host's IP address in square brackets.
 

+.new
+.vitem &$sender_helo_dnssec$&
+.vindex "&$sender_helo_dnssec$&"
+This boolean variable is true if a successful HELO verification was
+.cindex "DNS" "DNSSEC"
+done using DNS information the resolver library stated was authenticatied data.
+.wen
+

 .vitem &$sender_helo_name$&
 .vindex "&$sender_helo_name$&"
 When a message is received from a remote host that has issued a HELO or EHLO
 .vitem &$sender_helo_name$&
 .vindex "&$sender_helo_name$&"
 When a message is received from a remote host that has issued a HELO or EHLO


@@ -12103,8 +12240,9 @@ the &%-bs%& or &%-bS%& options.
 
 .vitem &$sender_host_address$&
 .vindex "&$sender_host_address$&"
 
 .vitem &$sender_host_address$&
 .vindex "&$sender_host_address$&"

-When a message is received from a remote host, this variable contains that
-host's IP address. For locally submitted messages, it is empty.
+When a message is received from a remote host using SMTP,
+this variable contains that
+host's IP address. For locally non-SMTP submitted messages, it is empty.

 
 .vitem &$sender_host_authenticated$&
 .vindex "&$sender_host_authenticated$&"
 
 .vitem &$sender_host_authenticated$&
 .vindex "&$sender_host_authenticated$&"


@@ -12118,9 +12256,11 @@ received. It is empty if there was no successful authentication. See also
 If an attempt to populate &$sender_host_name$& has been made
 (by reference, &%hosts_lookup%& or
 otherwise) then this boolean will have been set true if, and only if, the
 If an attempt to populate &$sender_host_name$& has been made
 (by reference, &%hosts_lookup%& or
 otherwise) then this boolean will have been set true if, and only if, the

-resolver library states that the reverse DNS was authenticated data.  At all
+resolver library states that both
+the reverse and forward DNS were authenticated data.  At all

 other times, this variable is false.
 
 other times, this variable is false.
 

+.cindex "DNS" "DNSSEC"

 It is likely that you will need to coerce DNSSEC support on in the resolver
 library, by setting:
 .code
 It is likely that you will need to coerce DNSSEC support on in the resolver
 library, by setting:
 .code


@@ -12130,9 +12270,6 @@ dns_dnssec_ok = 1
 Exim does not perform DNSSEC validation itself, instead leaving that to a
 validating resolver (eg, unbound, or bind with suitable configuration).
 
 Exim does not perform DNSSEC validation itself, instead leaving that to a
 validating resolver (eg, unbound, or bind with suitable configuration).
 

-Exim does not (currently) check to see if the forward DNS was also secured
-with DNSSEC, only the reverse DNS.
-

 If you have changed &%host_lookup_order%& so that &`bydns`& is not the first
 mechanism in the list, then this variable will be false.
 
 If you have changed &%host_lookup_order%& so that &`bydns`& is not the first
 mechanism in the list, then this variable will be false.
 


@@ -12360,9 +12497,7 @@ If TLS has not been negotiated, the value will be 0.
 This variable refers to the certificate presented to the peer of an
 inbound connection when the message was received.
 It is only useful as the argument of a
 This variable refers to the certificate presented to the peer of an
 inbound connection when the message was received.
 It is only useful as the argument of a

-.new

 &%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
 &%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,

-.wen

 or a &%def%& condition.
 
 .vitem &$tls_in_peercert$&
 or a &%def%& condition.
 
 .vitem &$tls_in_peercert$&


@@ -12370,28 +12505,26 @@ or a &%def%& condition.
 This variable refers to the certificate presented by the peer of an
 inbound connection when the message was received.
 It is only useful as the argument of a
 This variable refers to the certificate presented by the peer of an
 inbound connection when the message was received.
 It is only useful as the argument of a

-.new

 &%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
 &%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,

-.wen

 or a &%def%& condition.
 or a &%def%& condition.

+If certificate verification fails it may refer to a failing chain element
+which is not the leaf.

 
 .vitem &$tls_out_ourcert$&
 .vindex "&$tls_out_ourcert$&"
 This variable refers to the certificate presented to the peer of an
 outbound connection.  It is only useful as the argument of a
 
 .vitem &$tls_out_ourcert$&
 .vindex "&$tls_out_ourcert$&"
 This variable refers to the certificate presented to the peer of an
 outbound connection.  It is only useful as the argument of a

-.new

 &%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
 &%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,

-.wen

 or a &%def%& condition.
 
 .vitem &$tls_out_peercert$&
 .vindex "&$tls_out_peercert$&"
 This variable refers to the certificate presented by the peer of an
 outbound connection.  It is only useful as the argument of a
 or a &%def%& condition.
 
 .vitem &$tls_out_peercert$&
 .vindex "&$tls_out_peercert$&"
 This variable refers to the certificate presented by the peer of an
 outbound connection.  It is only useful as the argument of a

-.new

 &%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
 &%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,

-.wen

 or a &%def%& condition.
 or a &%def%& condition.

+If certificate verification fails it may refer to a failing chain element
+which is not the leaf.

 
 .vitem &$tls_in_certificate_verified$&
 .vindex "&$tls_in_certificate_verified$&"
 
 .vitem &$tls_in_certificate_verified$&
 .vindex "&$tls_in_certificate_verified$&"


@@ -12455,6 +12588,8 @@ When a message is received from a remote host over an encrypted SMTP
 connection, and Exim is configured to request a certificate from the client,
 the value of the Distinguished Name of the certificate is made available in the
 &$tls_in_peerdn$& during subsequent processing.
 connection, and Exim is configured to request a certificate from the client,
 the value of the Distinguished Name of the certificate is made available in the
 &$tls_in_peerdn$& during subsequent processing.

+If certificate verification fails it may refer to a failing chain element
+which is not the leaf.

 
 The deprecated &$tls_peerdn$& variable refers to the inbound side
 except when used in the context of an outbound SMTP delivery, when it refers to
 
 The deprecated &$tls_peerdn$& variable refers to the inbound side
 except when used in the context of an outbound SMTP delivery, when it refers to


@@ -12466,6 +12601,8 @@ When a message is being delivered to a remote host over an encrypted SMTP
 connection, and Exim is configured to request a certificate from the server,
 the value of the Distinguished Name of the certificate is made available in the
 &$tls_out_peerdn$& during subsequent processing.
 connection, and Exim is configured to request a certificate from the server,
 the value of the Distinguished Name of the certificate is made available in the
 &$tls_out_peerdn$& during subsequent processing.

+If certificate verification fails it may refer to a failing chain element
+which is not the leaf.

 
 .vitem &$tls_in_sni$&
 .vindex "&$tls_in_sni$&"
 
 .vitem &$tls_in_sni$&
 .vindex "&$tls_in_sni$&"


@@ -12543,6 +12680,13 @@ This variable contains the result of an expansion lookup, extraction operation,
 or external command, as described above. It is also used during a
 &*reduce*& expansion.
 
 or external command, as described above. It is also used during a
 &*reduce*& expansion.
 

+.vitem &$verify_mode$&
+.vindex "&$verify_mode$&"
+While a router or transport is being run in verify mode
+or for cutthrough delivery,
+contains "S" for sender-verification or "R" for recipient-verification.
+Otherwise, empty.
+

 .vitem &$version_number$&
 .vindex "&$version_number$&"
 The version number of Exim.
 .vitem &$version_number$&
 .vindex "&$version_number$&"
 The version number of Exim.


@@ -13089,6 +13233,7 @@ listed in more than one group.
 .row &%message_logs%&                "create per-message logs"
 .row &%preserve_message_logs%&       "after message completion"
 .row &%process_log_path%&            "for SIGUSR1 and &'exiwhat'&"
 .row &%message_logs%&                "create per-message logs"
 .row &%preserve_message_logs%&       "after message completion"
 .row &%process_log_path%&            "for SIGUSR1 and &'exiwhat'&"

+.row &%slow_lookup_log%&             "control logging of slow DNS lookups"

 .row &%syslog_duplication%&          "controls duplicate log lines on syslog"
 .row &%syslog_facility%&             "set syslog &""facility""& field"
 .row &%syslog_processname%&          "set syslog &""ident""& field"
 .row &%syslog_duplication%&          "controls duplicate log lines on syslog"
 .row &%syslog_facility%&             "set syslog &""facility""& field"
 .row &%syslog_processname%&          "set syslog &""ident""& field"


@@ -13202,6 +13347,7 @@ listed in more than one group.
 .row &%acl_smtp_mail%&               "ACL for MAIL"
 .row &%acl_smtp_mailauth%&           "ACL for AUTH on MAIL command"
 .row &%acl_smtp_mime%&               "ACL for MIME parts"
 .row &%acl_smtp_mail%&               "ACL for MAIL"
 .row &%acl_smtp_mailauth%&           "ACL for AUTH on MAIL command"
 .row &%acl_smtp_mime%&               "ACL for MIME parts"

+.row &%acl_smtp_notquit%&            "ACL for non-QUIT terminations"

 .row &%acl_smtp_predata%&            "ACL for start of data"
 .row &%acl_smtp_quit%&               "ACL for QUIT"
 .row &%acl_smtp_rcpt%&               "ACL for RCPT"
 .row &%acl_smtp_predata%&            "ACL for start of data"
 .row &%acl_smtp_quit%&               "ACL for QUIT"
 .row &%acl_smtp_rcpt%&               "ACL for RCPT"


@@ -13348,6 +13494,7 @@ See also the &'Policy controls'& section above.
 .table2
 .row &%accept_8bitmime%&             "advertise 8BITMIME"
 .row &%auth_advertise_hosts%&        "advertise AUTH to these hosts"
 .table2
 .row &%accept_8bitmime%&             "advertise 8BITMIME"
 .row &%auth_advertise_hosts%&        "advertise AUTH to these hosts"

+.row &%dsn_advertise_hosts%&         "advertise DSN extensions to these hosts"

 .row &%ignore_fromline_hosts%&       "allow &""From ""& from these hosts"
 .row &%ignore_fromline_local%&       "allow &""From ""& from local SMTP"
 .row &%pipelining_advertise_hosts%&  "advertise pipelining to these hosts"
 .row &%ignore_fromline_hosts%&       "allow &""From ""& from these hosts"
 .row &%ignore_fromline_local%&       "allow &""From ""& from local SMTP"
 .row &%pipelining_advertise_hosts%&  "advertise pipelining to these hosts"


@@ -13503,10 +13650,13 @@ This option defines the ACL that is run after an SMTP DATA command has been
 processed and the message itself has been received, but before the final
 acknowledgment is sent. See chapter &<<CHAPACL>>& for further details.
 
 processed and the message itself has been received, but before the final
 acknowledgment is sent. See chapter &<<CHAPACL>>& for further details.
 

-.option acl_smtp_data_prdr main string&!! unset
-.cindex "DATA" "ACL for"
+.new
+.option acl_smtp_data_prdr main string&!! accept
+.cindex "PRDR" "ACL for"
+.cindex "DATA" "PRDR ACL for"

 .cindex "&ACL;" "PRDR-related"
 .cindex "&ACL;" "per-user data processing"
 .cindex "&ACL;" "PRDR-related"
 .cindex "&ACL;" "per-user data processing"

+.wen

 This option defines the ACL that,
 if the PRDR feature has been negotiated,
 is run for each recipient after an SMTP DATA command has been
 This option defines the ACL that,
 if the PRDR feature has been negotiated,
 is run for each recipient after an SMTP DATA command has been


@@ -13547,6 +13697,12 @@ This option is available when Exim is built with the content-scanning
 extension. It defines the ACL that is run for each MIME part in a message. See
 section &<<SECTscanmimepart>>& for details.
 
 extension. It defines the ACL that is run for each MIME part in a message. See
 section &<<SECTscanmimepart>>& for details.
 

+.option acl_smtp_notquit main string&!! unset
+.cindex "not-QUIT, ACL for"
+This option defines the ACL that is run when an SMTP session
+ends without a QUIT command being received.
+See chapter &<<CHAPACL>>& for further details.
+

 .option acl_smtp_predata main string&!! unset
 This option defines the ACL that is run when an SMTP DATA command is
 received, before the message itself is received. See chapter &<<CHAPACL>>& for
 .option acl_smtp_predata main string&!! unset
 This option defines the ACL that is run when an SMTP DATA command is
 received, before the message itself is received. See chapter &<<CHAPACL>>& for


@@ -14057,6 +14213,8 @@ servers have all been upgraded, there should be no need for this option.
 
 .option dns_retrans main time 0s
 .cindex "DNS" "resolver options"
 
 .option dns_retrans main time 0s
 .cindex "DNS" "resolver options"

+.cindex timeout "dns lookup"
+.cindex "DNS" timeout

 The options &%dns_retrans%& and &%dns_retry%& can be used to set the
 retransmission and retry parameters for DNS lookups. Values of zero (the
 defaults) leave the system default settings unchanged. The first value is the
 The options &%dns_retrans%& and &%dns_retry%& can be used to set the
 retransmission and retry parameters for DNS lookups. Values of zero (the
 defaults) leave the system default settings unchanged. The first value is the


@@ -14066,6 +14224,7 @@ take. I haven't found any documentation about timeouts on DNS lookups; these
 parameter values are available in the external resolver interface structure,
 but nowhere does it seem to describe how they are used or what you might want
 to set in them.
 parameter values are available in the external resolver interface structure,
 but nowhere does it seem to describe how they are used or what you might want
 to set in them.

+See also the &%slow_lookup_log%& option.

 
 
 .option dns_retry main integer 0
 
 
 .option dns_retry main integer 0


@@ -14088,6 +14247,20 @@ This is an obsolete option that is now a no-op. It used to affect the way Exim
 handled CR and LF characters in incoming messages. What happens now is
 described in section &<<SECTlineendings>>&.
 
 handled CR and LF characters in incoming messages. What happens now is
 described in section &<<SECTlineendings>>&.
 

+.new
+.option dsn_advertise_hosts main "host list&!!" unset
+.cindex "bounce messages" "success"
+.cindex "DSN" "success"
+.cindex "Delivery Status Notification" "success"
+DSN extensions (RFC3461) will be advertised in the EHLO message to,
+and accepted from, these hosts.
+Hosts may use the NOTIFY and ENVID options on RCPT TO commands,
+and RET and ORCPT options on MAIL FROM commands.
+A NOTIFY=SUCCESS option requests success-DSN messages.
+A NOTIFY= option with no argument requests that no delay or failure DSNs
+are sent.
+.wen
+

 .option dsn_from main "string&!!" "see below"
 .cindex "&'From:'& header line" "in bounces"
 .cindex "bounce messages" "&'From:'& line, specifying"
 .option dsn_from main "string&!!" "see below"
 .cindex "&'From:'& header line" "in bounces"
 .cindex "bounce messages" "&'From:'& line, specifying"


@@ -14396,14 +14569,17 @@ is an IP literal matching the calling address of the host, or
 matches the host name that Exim obtains by doing a reverse lookup of the
 calling host address, or
 .next
 matches the host name that Exim obtains by doing a reverse lookup of the
 calling host address, or
 .next

-when looked up using &[gethostbyname()]& (or &[getipnodebyname()]& when
-available) yields the calling host address.
+when looked up in DNS yields the calling host address.

 .endlist
 
 However, the EHLO or HELO command is not rejected if any of the checks
 fail. Processing continues, but the result of the check is remembered, and can
 be detected later in an ACL by the &`verify = helo`& condition.
 
 .endlist
 
 However, the EHLO or HELO command is not rejected if any of the checks
 fail. Processing continues, but the result of the check is remembered, and can
 be detected later in an ACL by the &`verify = helo`& condition.
 

+If DNS was used for successful verification, the variable
+.cindex "DNS" "DNSSEC"
+&$helo_verify_dnssec$& records the DNSSEC status of the lookups.
+

 .option helo_verify_hosts main "host list&!!" unset
 .cindex "HELO verifying" "mandatory"
 .cindex "EHLO" "verifying, mandatory"
 .option helo_verify_hosts main "host list&!!" unset
 .cindex "HELO verifying" "mandatory"
 .cindex "EHLO" "verifying, mandatory"


@@ -14777,8 +14953,9 @@ section &<<SECTmessiden>>&.
 This option sets the path which is used to determine the names of Exim's log
 files, or indicates that logging is to be to syslog, or both. It is expanded
 when Exim is entered, so it can, for example, contain a reference to the host
 This option sets the path which is used to determine the names of Exim's log
 files, or indicates that logging is to be to syslog, or both. It is expanded
 when Exim is entered, so it can, for example, contain a reference to the host

-name. If no specific path is set for the log files at compile or run time, they
-are written in a sub-directory called &_log_& in Exim's spool directory.
+name. If no specific path is set for the log files at compile or run time,
+or if the option is unset at run time (i.e.  &`log_file_path = `&)
+they are written in a sub-directory called &_log_& in Exim's spool directory.

 Chapter &<<CHAPlog>>& contains further details about Exim's logging, and
 section &<<SECTwhelogwri>>& describes how the contents of &%log_file_path%& are
 used. If this string is fixed at your installation (contains no expansion
 Chapter &<<CHAPlog>>& contains further details about Exim's logging, and
 section &<<SECTwhelogwri>>& describes how the contents of &%log_file_path%& are
 used. If this string is fixed at your installation (contains no expansion


@@ -15005,16 +15182,21 @@ yourself in the foot in various unpleasant ways.  This option should not be
 adjusted lightly.  An unrecognised item will be detected at startup, by
 invoking Exim with the &%-bV%& flag.
 
 adjusted lightly.  An unrecognised item will be detected at startup, by
 invoking Exim with the &%-bV%& flag.
 

+The option affects Exim operating both as a server and as a client.
+

 Historical note: prior to release 4.80, Exim defaulted this value to
 "+dont_insert_empty_fragments", which may still be needed for compatibility
 with some clients, but which lowers security by increasing exposure to
 some now infamous attacks.
 
 Historical note: prior to release 4.80, Exim defaulted this value to
 "+dont_insert_empty_fragments", which may still be needed for compatibility
 with some clients, but which lowers security by increasing exposure to
 some now infamous attacks.
 

-An example:
+Examples:

 .code
 # Make both old MS and old Eudora happy:
 openssl_options = -all +microsoft_big_sslv3_buffer \
                        +dont_insert_empty_fragments
 .code
 # Make both old MS and old Eudora happy:
 openssl_options = -all +microsoft_big_sslv3_buffer \
                        +dont_insert_empty_fragments

+
+# Disable older protocol versions:
+openssl_options = +no_sslv2 +no_sslv3

 .endd
 
 Possible options may include:
 .endd
 
 Possible options may include:


@@ -15575,13 +15757,19 @@ the time of delivery. They are normally used only for final local deliveries.
 This option is an obsolete synonym for &%bounce_return_size_limit%&.
 
 
 This option is an obsolete synonym for &%bounce_return_size_limit%&.
 
 

-.option rfc1413_hosts main "host list&!!" *
+.new
+.option rfc1413_hosts main "host list&!!" @[]

 .cindex "RFC 1413"
 .cindex "host" "for RFC 1413 calls"
 .cindex "RFC 1413"
 .cindex "host" "for RFC 1413 calls"

-RFC 1413 identification calls are made to any client host which matches an item
-in the list.
+RFC 1413 identification calls are made to any client host which matches
+an item in the list.
+The default value specifies just this host, being any local interface
+for the system.
+.wen

 
 

-.option rfc1413_query_timeout main time 5s
+.new
+.option rfc1413_query_timeout main time 0s
+.wen

 .cindex "RFC 1413" "query timeout"
 .cindex "timeout" "for RFC 1413 call"
 This sets the timeout on RFC 1413 identification calls. If it is set to zero,
 .cindex "RFC 1413" "query timeout"
 .cindex "timeout" "for RFC 1413 call"
 This sets the timeout on RFC 1413 identification calls. If it is set to zero,


@@ -15600,6 +15788,16 @@ it qualifies them only if the message came from a host that matches
 using TCP/IP), and the &%-bnq%& option was not set.
 
 
 using TCP/IP), and the &%-bnq%& option was not set.
 
 

+.option slow_lookup_log main integer 0
+.cindex "logging" "slow lookups"
+.cindex "dns" "logging slow lookups"
+This option controls logging of slow lookups.
+If the value is nonzero it is taken as a number of milliseconds
+and lookups taking longer than this are logged.
+Currently this applies only to DNS lookups.
+
+
+

 .option smtp_accept_keepalive main boolean true
 .cindex "keepalive" "on incoming connection"
 This option controls the setting of the SO_KEEPALIVE option on incoming
 .option smtp_accept_keepalive main boolean true
 .cindex "keepalive" "on incoming connection"
 This option controls the setting of the SO_KEEPALIVE option on incoming


@@ -15975,7 +16173,7 @@ See &%smtp_ratelimit_hosts%& above.
 See &%smtp_ratelimit_hosts%& above.
 
 
 See &%smtp_ratelimit_hosts%& above.
 
 

-.option smtp_receive_timeout main time 5m
+.option smtp_receive_timeout main time&!! 5m

 .cindex "timeout" "for SMTP input"
 .cindex "SMTP" "input timeout"
 This sets a timeout value for SMTP reception. It applies to all forms of SMTP
 .cindex "timeout" "for SMTP input"
 .cindex "SMTP" "input timeout"
 This sets a timeout value for SMTP reception. It applies to all forms of SMTP


@@ -15990,6 +16188,10 @@ SMTP data timeout on connection from...
 The former means that Exim was expecting to read an SMTP command; the latter
 means that it was in the DATA phase, reading the contents of a message.
 
 The former means that Exim was expecting to read an SMTP command; the latter
 means that it was in the DATA phase, reading the contents of a message.
 

+If the first character of the option is a &"$"& the option is
+expanded before use and may depend on
+&$sender_host_name$&, &$sender_host_address$& and &$sender_host_port$&.
+

 
 .oindex "&%-os%&"
 The value set by this option can be overridden by the
 
 .oindex "&%-os%&"
 The value set by this option can be overridden by the


@@ -16429,22 +16631,37 @@ preference order of the available ciphers. Details are given in sections
 See &%tls_verify_hosts%& below.
 
 
 See &%tls_verify_hosts%& below.
 
 

-.option tls_verify_certificates main string&!! unset
+.new
+.option tls_verify_certificates main string&!! system

 .cindex "TLS" "client certificate verification"
 .cindex "certificate" "verification of client"
 .cindex "TLS" "client certificate verification"
 .cindex "certificate" "verification of client"

-The value of this option is expanded, and must then be the absolute path to
-a file containing permitted certificates for clients that
-match &%tls_verify_hosts%& or &%tls_try_verify_hosts%&. Alternatively, if you
-are using OpenSSL, you can set &%tls_verify_certificates%& to the name of a
-directory containing certificate files. This does not work with GnuTLS; the
-option must be set to the name of a single file if you are using GnuTLS.
+The value of this option is expanded, and must then be either the
+word "system"
+or the absolute path to
+a file or directory containing permitted certificates for clients that
+match &%tls_verify_hosts%& or &%tls_try_verify_hosts%&.
+
+The "system" value for the option will use a
+system default location compiled into the SSL library.
+This is not available for GnuTLS versions preceding 3.0.20,
+and will be taken as empty; an explicit location
+must be specified.
+
+The use of a directory for the option value is not avilable for GnuTLS versions
+preceding 3.3.6 and a single file must be used.
+
+With OpenSSL the certificates specified
+explicitly
+either by file or directory
+are added to those given by the system default location.
+.wen

 
 These certificates should be for the certificate authorities trusted, rather
 than the public cert of individual clients.  With both OpenSSL and GnuTLS, if
 the value is a file then the certificates are sent by Exim as a server to
 connecting clients, defining the list of accepted certificate authorities.
 Thus the values defined should be considered public data.  To avoid this,
 
 These certificates should be for the certificate authorities trusted, rather
 than the public cert of individual clients.  With both OpenSSL and GnuTLS, if
 the value is a file then the certificates are sent by Exim as a server to
 connecting clients, defining the list of accepted certificate authorities.
 Thus the values defined should be considered public data.  To avoid this,

-use OpenSSL with a directory.
+use the explicit directory version.

 
 See &<<SECTtlssni>>& for discussion of when this option might be re-expanded.
 
 
 See &<<SECTtlssni>>& for discussion of when this option might be re-expanded.
 


@@ -16813,6 +17030,46 @@ If the expansion fails (other than forced failure) delivery is deferred. Some
 of the other precondition options are common special cases that could in fact
 be specified using &%condition%&.
 
 of the other precondition options are common special cases that could in fact
 be specified using &%condition%&.
 

+Historical note: We have &%condition%& on ACLs and on Routers.  Routers
+are far older, and use one set of semantics.  ACLs are newer and when
+they were created, the ACL &%condition%& process was given far stricter
+parse semantics.  The &%bool{}%& expansion condition uses the same rules as
+ACLs.  The &%bool_lax{}%& expansion condition uses the same rules as
+Routers.  More pointedly, the &%bool_lax{}%& was written to match the existing
+Router rules processing behavior.
+
+This is best illustrated in an example:
+.code
+# If used in an ACL condition will fail with a syntax error, but
+# in a router condition any extra characters are treated as a string
+
+$ exim -be '${if eq {${lc:GOOGLE.com}} {google.com}} {yes} {no}}'
+true {yes} {no}}
+
+$ exim -be '${if eq {${lc:WHOIS.com}} {google.com}} {yes} {no}}'
+ {yes} {no}}
+.endd
+In each example above, the &%if%& statement actually ends after
+&"{google.com}}"&.  Since no true or false braces were defined, the
+default &%if%& behavior is to return a boolean true or a null answer
+(which evaluates to false). The rest of the line is then treated as a
+string. So the first example resulted in the boolean answer &"true"&
+with the string &" {yes} {no}}"& appended to it. The second example
+resulted in the null output (indicating false) with the string
+&" {yes} {no}}"& appended to it.
+
+In fact you can put excess forward braces in too.  In the router
+&%condition%&, Exim's parser only looks for &"{"& symbols when they
+mean something, like after a &"$"& or when required as part of a
+conditional.  But otherwise &"{"& and &"}"& are treated as ordinary
+string characters.
+
+Thus, in a Router, the above expansion strings will both always evaluate
+true, as the result of expansion is a non-empty string which doesn't
+match an explicit false value.  This can be tricky to debug.  By
+contrast, in an ACL either of those strings will always result in an
+expansion error because the result doesn't look sufficiently boolean.
+

 
 .option debug_print routers string&!! unset
 .cindex "testing" "variables in drivers"
 
 .option debug_print routers string&!! unset
 .cindex "testing" "variables in drivers"


@@ -16837,6 +17094,25 @@ or for any deliveries caused by this router. You should not set this option
 unless you really, really know what you are doing. See also the generic
 transport option of the same name.
 
 unless you really, really know what you are doing. See also the generic
 transport option of the same name.
 

+.option dnssec_request_domains routers "domain list&!!" unset
+.cindex "MX record" "security"
+.cindex "DNSSEC" "MX lookup"
+.cindex "security" "MX lookup"
+.cindex "DNS" "DNSSEC"
+DNS lookups for domains matching &%dnssec_request_domains%& will be done with
+the dnssec request bit set.
+This applies to all of the SRV, MX, AAAA, A lookup sequence.
+
+.option dnssec_require_domains routers "domain list&!!" unset
+.cindex "MX record" "security"
+.cindex "DNSSEC" "MX lookup"
+.cindex "security" "MX lookup"
+.cindex "DNS" "DNSSEC"
+DNS lookups for domains matching &%dnssec_request_domains%& will be done with
+the dnssec request bit set.  Any returns not having the Authenticated Data bit
+(AD bit) set will be ignored and logged as a host-lookup failure.
+This applies to all of the SRV, MX, AAAA, A lookup sequence.
+

 
 .option domains routers&!? "domain list&!!" unset
 .cindex "router" "restricting to specific domains"
 
 .option domains routers&!? "domain list&!!" unset
 .cindex "router" "restricting to specific domains"


@@ -16854,6 +17130,17 @@ This option must always be set. It specifies which of the available routers is
 to be used.
 
 
 to be used.
 
 

+.new
+.option dsn_lasthop routers boolean false
+.cindex "DSN" "success"
+.cindex "Delivery Status Notification" "success"
+If this option is set true, and extended DSN (RFC3461) processing is in effect,
+Exim will not pass on DSN requests to downstream DSN-aware hosts but will
+instead send a success DSN as if the next hop does not support DSN.
+Not effective on redirect routers.
+.wen
+
+

 
 .option errors_to routers string&!! unset
 .cindex "envelope sender"
 
 .option errors_to routers string&!! unset
 .cindex "envelope sender"


@@ -16975,7 +17262,10 @@ and the discussion in chapter &<<CHAPenvironment>>&.
 .option headers_add routers list&!! unset
 .cindex "header lines" "adding"
 .cindex "router" "adding header lines"
 .option headers_add routers list&!! unset
 .cindex "header lines" "adding"
 .cindex "router" "adding header lines"

-This option specifies a list of text headers, newline-separated,
+This option specifies a list of text headers,
+.new
+newline-separated (by default, changeable in the usual way),
+.wen

 that is associated with any addresses that are accepted by the router.
 Each item is separately expanded, at routing time.  However, this
 option has no effect when an address is just being verified. The way in which
 that is associated with any addresses that are accepted by the router.
 Each item is separately expanded, at routing time.  However, this
 option has no effect when an address is just being verified. The way in which


@@ -17012,7 +17302,10 @@ avoided. The &%repeat_use%& option of the &%redirect%& router may be of help.
 .option headers_remove routers list&!! unset
 .cindex "header lines" "removing"
 .cindex "router" "removing header lines"
 .option headers_remove routers list&!! unset
 .cindex "header lines" "removing"
 .cindex "router" "removing header lines"

-This option specifies a list of text headers, colon-separated,
+This option specifies a list of text headers,
+.new
+colon-separated (by default, changeable in the usual way),
+.wen

 that is associated with any addresses that are accepted by the router.
 Each item is separately expanded, at routing time.  However, this
 option has no effect when an address is just being verified. The way in which
 that is associated with any addresses that are accepted by the router.
 Each item is separately expanded, at routing time.  However, this
 option has no effect when an address is just being verified. The way in which


@@ -17686,6 +17979,7 @@ delivering in cutthrough mode
 or testing recipient verification using &%-bv%&.
 See section &<<SECTrouprecon>>& for a list of the order in which preconditions
 are evaluated.
 or testing recipient verification using &%-bv%&.
 See section &<<SECTrouprecon>>& for a list of the order in which preconditions
 are evaluated.

+See also the &$verify_mode$& variable.

 
 
 .option verify_sender routers&!? boolean true
 
 
 .option verify_sender routers&!? boolean true


@@ -17693,6 +17987,7 @@ If this option is false, the router is skipped when verifying sender addresses
 or testing sender verification using &%-bvs%&.
 See section &<<SECTrouprecon>>& for a list of the order in which preconditions
 are evaluated.
 or testing sender verification using &%-bvs%&.
 See section &<<SECTrouprecon>>& for a list of the order in which preconditions
 are evaluated.

+See also the &$verify_mode$& variable.

 .ecindex IIDgenoprou1
 .ecindex IIDgenoprou2
 
 .ecindex IIDgenoprou1
 .ecindex IIDgenoprou2
 


@@ -17789,6 +18084,9 @@ There are a few cases where a &(dnslookup)& router will decline to accept
 an address; if such a router is expected to handle "all remaining non-local
 domains", then it is important to set &%no_more%&.
 
 an address; if such a router is expected to handle "all remaining non-local
 domains", then it is important to set &%no_more%&.
 

+The router will defer rather than decline if the domain
+is found in the &%fail_defer_domains%& router option.
+

 Reasons for a &(dnslookup)& router to decline currently include:
 .ilist
 The domain does not exist in DNS
 Reasons for a &(dnslookup)& router to decline currently include:
 .ilist
 The domain does not exist in DNS


@@ -17867,27 +18165,16 @@ when there is a DNS lookup error.
 
 
 
 
 
 

-.option dnssec_request_domains dnslookup "domain list&!!" unset
-.cindex "MX record" "security"
-.cindex "DNSSEC" "MX lookup"
-.cindex "security" "MX lookup"
-.cindex "DNS" "DNSSEC"
-DNS lookups for domains matching &%dnssec_request_domains%& will be done with
-the dnssec request bit set.
-This applies to all of the SRV, MX A6, AAAA, A lookup sequence.
-
-
-
-.option dnssec_require_domains dnslookup "domain list&!!" unset
-.cindex "MX record" "security"
-.cindex "DNSSEC" "MX lookup"
-.cindex "security" "MX lookup"
-.cindex "DNS" "DNSSEC"
-DNS lookups for domains matching &%dnssec_request_domains%& will be done with
-the dnssec request bit set.  Any returns not having the Authenticated Data bit
-(AD bit) set wil be ignored and logged as a host-lookup failure.
-This applies to all of the SRV, MX A6, AAAA, A lookup sequence.

 
 

+.option fail_defer_domains dnslookup "domain list&!!" unset
+.cindex "MX record" "not found"
+DNS lookups for domains matching &%fail_defer_domains%&
+which find no matching record will cause the router to defer
+rather than the default behaviour of decline.
+This maybe be useful for queueing messages for a newly created
+domain while the DNS configuration is not ready.
+However, it will result in any message with mistyped domains
+also being queued.

 
 
 .option mx_domains dnslookup "domain list&!!" unset
 
 
 .option mx_domains dnslookup "domain list&!!" unset


@@ -18858,6 +19145,13 @@ However, there are some private options which define transports for delivery to
 files and pipes, and for generating autoreplies. See the &%file_transport%&,
 &%pipe_transport%& and &%reply_transport%& descriptions below.
 
 files and pipes, and for generating autoreplies. See the &%file_transport%&,
 &%pipe_transport%& and &%reply_transport%& descriptions below.
 

+.new
+If success DSNs have been requested
+.cindex "DSN" "success"
+.cindex "Delivery Status Notification" "success"
+redirection triggers one and the DSN options are not passed any further.
+.wen
+

 
 
 .section "Redirection data" "SECID124"
 
 
 .section "Redirection data" "SECID124"


@@ -20050,7 +20344,10 @@ value that the router supplies, and also overriding any value associated with
 .option headers_add transports list&!! unset
 .cindex "header lines" "adding in transport"
 .cindex "transport" "header lines; adding"
 .option headers_add transports list&!! unset
 .cindex "header lines" "adding in transport"
 .cindex "transport" "header lines; adding"

-This option specifies a list of text headers, newline-separated,
+This option specifies a list of text headers,
+.new
+newline-separated (by default, changeable in the usual way),
+.wen

 which are (separately) expanded and added to the header
 portion of a message as it is transported, as described in section
 &<<SECTheadersaddrem>>&. Additional header lines can also be specified by
 which are (separately) expanded and added to the header
 portion of a message as it is transported, as described in section
 &<<SECTheadersaddrem>>&. Additional header lines can also be specified by


@@ -20075,7 +20372,10 @@ checked, since this option does not automatically suppress them.
 .option headers_remove transports list&!! unset
 .cindex "header lines" "removing"
 .cindex "transport" "header lines; removing"
 .option headers_remove transports list&!! unset
 .cindex "header lines" "removing"
 .cindex "transport" "header lines; removing"

-This option specifies a list of header names, colon-separated;
+This option specifies a list of header names,
+.new
+colon-separated (by default, changeable in the usual way);
+.wen

 these headers are omitted from the message as it is transported, as described
 in section &<<SECTheadersaddrem>>&. Header removal can also be specified by
 routers.
 these headers are omitted from the message as it is transported, as described
 in section &<<SECTheadersaddrem>>&. Header removal can also be specified by
 routers.


@@ -22800,7 +23100,7 @@ details.
 .cindex "DNS" "DNSSEC"
 DNS lookups for domains matching &%dnssec_request_domains%& will be done with
 the dnssec request bit set.
 .cindex "DNS" "DNSSEC"
 DNS lookups for domains matching &%dnssec_request_domains%& will be done with
 the dnssec request bit set.

-This applies to all of the SRV, MX A6, AAAA, A lookup sequence.
+This applies to all of the SRV, MX, AAAA, A lookup sequence.

 
 
 
 
 
 


@@ -22812,7 +23112,7 @@ This applies to all of the SRV, MX A6, AAAA, A lookup sequence.
 DNS lookups for domains matching &%dnssec_request_domains%& will be done with
 the dnssec request bit set.  Any returns not having the Authenticated Data bit
 (AD bit) set wil be ignored and logged as a host-lookup failure.
 DNS lookups for domains matching &%dnssec_request_domains%& will be done with
 the dnssec request bit set.  Any returns not having the Authenticated Data bit
 (AD bit) set wil be ignored and logged as a host-lookup failure.

-This applies to all of the SRV, MX A6, AAAA, A lookup sequence.
+This applies to all of the SRV, MX, AAAA, A lookup sequence.

 
 
 
 
 
 


@@ -22963,12 +23263,13 @@ that matches this list, even if the server host advertises PIPELINING support.
 Exim will not try to start a TLS session when delivering to any host that
 matches this list. See chapter &<<CHAPTLS>>& for details of TLS.
 
 Exim will not try to start a TLS session when delivering to any host that
 matches this list. See chapter &<<CHAPTLS>>& for details of TLS.
 

-.option hosts_verify_avoid_tls smtp "host list&!!" *
+.new
+.option hosts_verify_avoid_tls smtp "host list&!!" unset

 .cindex "TLS" "avoiding for certain hosts"
 Exim will not try to start a TLS session for a verify callout,
 or when delivering in cutthrough mode,
 to any host that matches this list.
 .cindex "TLS" "avoiding for certain hosts"
 Exim will not try to start a TLS session for a verify callout,
 or when delivering in cutthrough mode,
 to any host that matches this list.

-Note that the default is to not use TLS.
+.wen

 
 
 .option hosts_max_try smtp integer 5
 
 
 .option hosts_max_try smtp integer 5


@@ -23065,11 +23366,14 @@ connects. If authentication fails, Exim will try to transfer the message
 unauthenticated. See also &%hosts_require_auth%&, and chapter
 &<<CHAPSMTPAUTH>>& for details of authentication.
 
 unauthenticated. See also &%hosts_require_auth%&, and chapter
 &<<CHAPSMTPAUTH>>& for details of authentication.
 

-.option hosts_try_prdr smtp "host list&!!" unset
+.new
+.option hosts_try_prdr smtp "host list&!!" *

 .cindex "PRDR" "enabling, optional in client"
 This option provides a list of servers to which, provided they announce
 PRDR support, Exim will attempt to negotiate PRDR
 for multi-recipient messages.
 .cindex "PRDR" "enabling, optional in client"
 This option provides a list of servers to which, provided they announce
 PRDR support, Exim will attempt to negotiate PRDR
 for multi-recipient messages.

+The option can usually be left as default.
+.wen

 
 .option interface smtp "string list&!!" unset
 .cindex "bind IP address"
 
 .option interface smtp "string list&!!" unset
 .cindex "bind IP address"


@@ -23127,7 +23431,7 @@ so can cause parallel connections to the same host if &%remote_max_parallel%&
 permits this.
 
 
 permits this.
 
 

-.option multi_domain smtp boolean true
+.option multi_domain smtp boolean&!! true

 .vindex "&$domain$&"
 When this option is set, the &(smtp)& transport can handle a number of
 addresses containing a mixture of different domains provided they all resolve
 .vindex "&$domain$&"
 When this option is set, the &(smtp)& transport can handle a number of
 addresses containing a mixture of different domains provided they all resolve


@@ -23136,6 +23440,11 @@ handling only one domain at a time. This is useful if you want to use
 &$domain$& in an expansion for the transport, because it is set only when there
 is a single domain involved in a remote delivery.
 
 &$domain$& in an expansion for the transport, because it is set only when there
 is a single domain involved in a remote delivery.
 

+.new
+It is expanded per-address and can depend on any of
+&$address_data$&, &$domain_data$&, &$local_part_data$&,
+&$host$&, &$host_address$& and &$host_port$&.
+.wen

 
 .option port smtp string&!! "see below"
 .cindex "port" "sending TCP/IP"
 
 .option port smtp string&!! "see below"
 .cindex "port" "sending TCP/IP"


@@ -23171,7 +23480,7 @@ connecting, as an outbound SSL-on-connect, instead of using STARTTLS to upgrade.
 The Internet standards bodies strongly discourage use of this mode.
 
 
 The Internet standards bodies strongly discourage use of this mode.
 
 

-.option retry_include_ip_address smtp boolean true
+.option retry_include_ip_address smtp boolean&!! true

 Exim normally includes both the host name and the IP address in the key it
 constructs for indexing retry data after a temporary delivery failure. This
 means that when one of several IP addresses for a host is failing, it gets
 Exim normally includes both the host name and the IP address in the key it
 constructs for indexing retry data after a temporary delivery failure. This
 means that when one of several IP addresses for a host is failing, it gets


@@ -23181,9 +23490,10 @@ addresses is not affected.
 However, in some dialup environments hosts are assigned a different IP address
 each time they connect. In this situation the use of the IP address as part of
 the retry key leads to undesirable behaviour. Setting this option false causes
 However, in some dialup environments hosts are assigned a different IP address
 each time they connect. In this situation the use of the IP address as part of
 the retry key leads to undesirable behaviour. Setting this option false causes

-Exim to use only the host name. This should normally be done on a separate
-instance of the &(smtp)& transport, set up specially to handle the dialup
-hosts.
+Exim to use only the host name.
+.new
+Since it is expanded it can be made to depend on the host or domain.
+.wen

 
 
 .option serialize_hosts smtp "host list&!!" unset
 
 
 .option serialize_hosts smtp "host list&!!" unset


@@ -23321,7 +23631,9 @@ unknown state), opens a new one to the same host, and then tries the delivery
 in clear.
 
 
 in clear.
 
 

-.option tls_try_verify_hosts smtp "host list&!! unset
+.new
+.option tls_try_verify_hosts smtp "host list&!!" *
+.wen

 .cindex "TLS" "server certificate verification"
 .cindex "certificate" "verification of server"
 This option gives a list of hosts for which, on encrypted connections,
 .cindex "TLS" "server certificate verification"
 .cindex "certificate" "verification of server"
 This option gives a list of hosts for which, on encrypted connections,


@@ -23329,31 +23641,63 @@ certificate verification will be tried but need not succeed.
 The &%tls_verify_certificates%& option must also be set.
 Note that unless the host is in this list
 TLS connections will be denied to hosts using self-signed certificates
 The &%tls_verify_certificates%& option must also be set.
 Note that unless the host is in this list
 TLS connections will be denied to hosts using self-signed certificates

-when &%tls_verify_certificates%& is set.
+when &%tls_verify_certificates%& is matched.

 The &$tls_out_certificate_verified$& variable is set when
 certificate verification succeeds.
 
 
 The &$tls_out_certificate_verified$& variable is set when
 certificate verification succeeds.
 
 

-.option tls_verify_certificates smtp string&!! unset
+.new
+.option tls_verify_cert_hostnames smtp "host list&!!" *
+.cindex "TLS" "server certificate hostname verification"
+.cindex "certificate" "verification of server"
+This option give a list of hosts for which,
+while verifying the server certificate,
+checks will be included on the host name
+(note that this will generally be the result of a DNS MX lookup)
+versus Subject and Subject-Alternate-Name fields.  Wildcard names are permitted
+limited to being the initial component of a 3-or-more component FQDN.
+
+There is no equivalent checking on client certificates.
+.wen
+
+
+.new
+.option tls_verify_certificates smtp string&!! system

 .cindex "TLS" "server certificate verification"
 .cindex "certificate" "verification of server"
 .vindex "&$host$&"
 .vindex "&$host_address$&"
 .cindex "TLS" "server certificate verification"
 .cindex "certificate" "verification of server"
 .vindex "&$host$&"
 .vindex "&$host_address$&"

-The value of this option must be the absolute path to a file containing
-permitted server certificates, for use when setting up an encrypted connection.
-Alternatively, if you are using OpenSSL, you can set
-&%tls_verify_certificates%& to the name of a directory containing certificate
-files. This does not work with GnuTLS; the option must be set to the name of a
-single file if you are using GnuTLS. The values of &$host$& and
+The value of this option must be either the
+word "system"
+or the absolute path to
+a file or directory containing permitted certificates for servers,
+for use when setting up an encrypted connection.
+
+The "system" value for the option will use a location compiled into the SSL library.
+This is not available for GnuTLS versions preceding 3.0.20; a value of "system"
+is taken as empty and an explicit location
+must be specified.
+
+The use of a directory for the option value is not avilable for GnuTLS versions
+preceding 3.3.6 and a single file must be used.
+.wen
+
+With OpenSSL the certificates specified
+explicitly
+either by file or directory
+are added to those given by the system default location.
+
+The values of &$host$& and

 &$host_address$& are set to the name and address of the server during the
 expansion of this option. See chapter &<<CHAPTLS>>& for details of TLS.
 
 For back-compatability,
 if neither tls_verify_hosts nor tls_try_verify_hosts are set
 &$host_address$& are set to the name and address of the server during the
 expansion of this option. See chapter &<<CHAPTLS>>& for details of TLS.
 
 For back-compatability,
 if neither tls_verify_hosts nor tls_try_verify_hosts are set

+(a single-colon empty list counts as being set)

 and certificate verification fails the TLS connection is closed.
 
 
 and certificate verification fails the TLS connection is closed.
 
 

-.option tls_verify_hosts smtp "host list&!! unset
+.option tls_verify_hosts smtp "host list&!!" unset

 .cindex "TLS" "server certificate verification"
 .cindex "certificate" "verification of server"
 This option gives a list of hosts for which. on encrypted connections,
 .cindex "TLS" "server certificate verification"
 .cindex "certificate" "verification of server"
 This option gives a list of hosts for which. on encrypted connections,


@@ -24104,6 +24448,13 @@ A server unexpectedly closed the SMTP connection. There may, of course,
 legitimate reasons for this (host died, network died), but if it repeats a lot
 for the same host, it indicates something odd.
 
 legitimate reasons for this (host died, network died), but if it repeats a lot
 for the same host, it indicates something odd.
 

+.vitem &%lookup%&
+A DNS lookup for a host failed.
+Note that a &%dnslookup%& router will need to have matched
+its &%fail_defer_domains%& option for this retry type to be usable.
+Also note that a &%manualroute%& router will probably need
+its &%host_find_failed%& option set to &%defer%&.
+

 .vitem &%refused_MX%&
 A connection to a host obtained from an MX record was refused.
 
 .vitem &%refused_MX%&
 A connection to a host obtained from an MX record was refused.
 


@@ -24515,6 +24866,7 @@ AUTH_GSASL=yes
 AUTH_HEIMDAL_GSSAPI=yes
 AUTH_PLAINTEXT=yes
 AUTH_SPA=yes
 AUTH_HEIMDAL_GSSAPI=yes
 AUTH_PLAINTEXT=yes
 AUTH_SPA=yes

+AUTH_TLS=yes

 .endd
 in &_Local/Makefile_&, respectively. The first of these supports the CRAM-MD5
 authentication mechanism (RFC 2195), and the second provides an interface to
 .endd
 in &_Local/Makefile_&, respectively. The first of these supports the CRAM-MD5
 authentication mechanism (RFC 2195), and the second provides an interface to


@@ -24529,6 +24881,8 @@ The sixth can be configured to support
 the PLAIN authentication mechanism (RFC 2595) or the LOGIN mechanism, which is
 not formally documented, but used by several MUAs. The seventh authenticator
 supports Microsoft's &'Secure Password Authentication'& mechanism.
 the PLAIN authentication mechanism (RFC 2595) or the LOGIN mechanism, which is
 not formally documented, but used by several MUAs. The seventh authenticator
 supports Microsoft's &'Secure Password Authentication'& mechanism.

+The eighth is an Exim authenticator but not an SMTP one;
+instead it can use information from a TLS negotiation.

 
 The authenticators are configured using the same syntax as other drivers (see
 section &<<SECTfordricon>>&). If no authenticators are required, no
 
 The authenticators are configured using the same syntax as other drivers (see
 section &<<SECTfordricon>>&). If no authenticators are required, no


@@ -25735,6 +26089,81 @@ msn:
 
 
 
 
 
 

+. ////////////////////////////////////////////////////////////////////////////
+. ////////////////////////////////////////////////////////////////////////////
+
+.new
+.chapter "The tls authenticator" "CHAPtlsauth"
+.scindex IIDtlsauth1 "&(tls)& authenticator"
+.scindex IIDtlsauth2 "authenticators" "&(tls)&"
+.cindex "authentication" "Client Certificate"
+.cindex "authentication" "X509"
+.cindex "Certificate-based authentication"
+The &(tls)& authenticator provides server support for
+authentication based on client certificates.
+
+It is not an SMTP authentication mechanism and is not
+advertised by the server as part of the SMTP EHLO response.
+It is an Exim authenticator in the sense that it affects
+the protocol element of the log line, can be tested for
+by the &%authenticated%& ACL condition, and can set
+the &$authenticated_id$& variable.
+
+The client must present a verifiable certificate,
+for which it must have been requested via the
+&%tls_verify_hosts%& or &%tls_try_verify_hosts%& main options
+(see &<<CHAPTLS>>&).
+
+If an authenticator of this type is configured it is
+run before any SMTP-level communication is done,
+and can authenticate the connection.
+If it does, SMTP suthentication is not offered.
+
+A maximum of one authenticator of this type may be present.
+
+
+.cindex "options" "&(tls)& authenticator (server)"
+The &(tls)& authenticator has three server options:
+
+.option server_param1 tls string&!! unset
+.cindex "variables (&$auth1$& &$auth2$& etc)" "in &(tls)& authenticator"
+This option is expanded after the TLS negotiation and
+the result is placed in &$auth1$&.
+If the expansion is forced to fail, authentication fails. Any other expansion
+failure causes a temporary error code to be returned.
+
+.option server_param2 tls string&!! unset
+.option server_param3 tls string&!! unset
+As above, for &$auth2$& and &$auth3$&.
+
+&%server_param1%& may also be spelled &%server_param%&.
+
+
+Example:
+.code
+tls:
+  driver = tls
+  server_param1 =     ${certextract {subj_altname,mail,>:} \
+                                    {$tls_in_peercert}}
+  server_condition =  ${if forany {$auth1} \
+                            {!= {0} \
+                                {${lookup ldap{ldap:///\
+                         mailname=${quote_ldap_dn:${lc:$item}},\
+                         ou=users,LDAP_DC?mailid} {$value}{0} \
+                       }    }   } }
+  server_set_id =     ${if = {1}{${listcount:$auth1}} {$auth1}{}}
+.endd
+.ecindex IIDtlsauth1
+.ecindex IIDtlsauth2
+.wen
+
+
+Note that because authentication is traditionally an SMTP operation,
+the &%authenticated%& ACL condition cannot be used in
+a connect- or helo-ACL.
+
+
+

 . ////////////////////////////////////////////////////////////////////////////
 . ////////////////////////////////////////////////////////////////////////////
 
 . ////////////////////////////////////////////////////////////////////////////
 . ////////////////////////////////////////////////////////////////////////////
 


@@ -25825,8 +26254,10 @@ include files and libraries for GnuTLS can be found.
 There are some differences in usage when using GnuTLS instead of OpenSSL:
 
 .ilist
 There are some differences in usage when using GnuTLS instead of OpenSSL:
 
 .ilist

-The &%tls_verify_certificates%& option must contain the name of a file, not the
-name of a directory (for OpenSSL it can be either).
+The &%tls_verify_certificates%& option
+cannot be the path of a directory
+for GnuTLS versions before 3.3.6
+(for later versions, or OpenSSL, it can be either).

 .next
 The default value for &%tls_dhparam%& differs for historical reasons.
 .next
 .next
 The default value for &%tls_dhparam%& differs for historical reasons.
 .next


@@ -26023,7 +26454,8 @@ The GnuTLS library allows the caller to provide a "priority string", documented
 as part of the &[gnutls_priority_init]& function.  This is very similar to the
 ciphersuite specification in OpenSSL.
 
 as part of the &[gnutls_priority_init]& function.  This is very similar to the
 ciphersuite specification in OpenSSL.
 

-The &%tls_require_ciphers%& option is treated as the GnuTLS priority string.
+The &%tls_require_ciphers%& option is treated as the GnuTLS priority string
+and controls both protocols and ciphers.

 
 The &%tls_require_ciphers%& option is available both as an global option,
 controlling how Exim behaves as a server, and also as an option of the
 
 The &%tls_require_ciphers%& option is available both as an global option,
 controlling how Exim behaves as a server, and also as an option of the


@@ -26040,6 +26472,12 @@ installed on your system.  If you are using GnuTLS 3,
 &url(http://www.gnutls.org/manual/gnutls.html#Listing-the-ciphersuites-in-a-priority-string, then the example code)
 on that site can be used to test a given string.
 
 &url(http://www.gnutls.org/manual/gnutls.html#Listing-the-ciphersuites-in-a-priority-string, then the example code)
 on that site can be used to test a given string.
 

+For example:
+.code
+# Disable older versions of protocols
+tls_require_ciphers = NORMAL:%LATEST_RECORD_VERSION:-VERS-SSL3.0
+.endd
+

 Prior to Exim 4.80, an older API of GnuTLS was used, and Exim supported three
 additional options, "&%gnutls_require_kx%&", "&%gnutls_require_mac%&" and
 "&%gnutls_require_protocols%&".  &%tls_require_ciphers%& was an Exim list.
 Prior to Exim 4.80, an older API of GnuTLS was used, and Exim supported three
 additional options, "&%gnutls_require_kx%&", "&%gnutls_require_mac%&" and
 "&%gnutls_require_protocols%&".  &%tls_require_ciphers%& was an Exim list.


@@ -26090,8 +26528,11 @@ tls_privatekey = /some/file/name
 These options are, in fact, expanded strings, so you can make them depend on
 the identity of the client that is connected if you wish. The first file
 contains the server's X509 certificate, and the second contains the private key
 These options are, in fact, expanded strings, so you can make them depend on
 the identity of the client that is connected if you wish. The first file
 contains the server's X509 certificate, and the second contains the private key

-that goes with it. These files need to be readable by the Exim user, and must
-always be given as full path names. They can be the same file if both the
+that goes with it. These files need to be
+PEM format and readable by the Exim user, and must
+always be given as full path names.
+The key must not be password-protected.
+They can be the same file if both the

 certificate and the key are contained within it. If &%tls_privatekey%& is not
 set, or if its expansion is forced to fail or results in an empty string, this
 is assumed to be the case. The certificate file may also contain intermediate
 certificate and the key are contained within it. If &%tls_privatekey%& is not
 set, or if its expansion is forced to fail or results in an empty string, this
 is assumed to be the case. The certificate file may also contain intermediate


@@ -26167,8 +26608,12 @@ session with a client, you must set either &%tls_verify_hosts%& or
 apply to all TLS connections. For any host that matches one of these options,
 Exim requests a certificate as part of the setup of the TLS session. The
 contents of the certificate are verified by comparing it with a list of
 apply to all TLS connections. For any host that matches one of these options,
 Exim requests a certificate as part of the setup of the TLS session. The
 contents of the certificate are verified by comparing it with a list of

-expected certificates. These must be available in a file or,
-for OpenSSL only (not GnuTLS), a directory, identified by
+expected certificates.
+.new
+These may be the system default set (depending on library version),
+.wen
+an explicit file or,
+depending on library version, a directory, identified by

 &%tls_verify_certificates%&.
 
 A file can contain multiple certificates, concatenated end to end. If a
 &%tls_verify_certificates%&.
 
 A file can contain multiple certificates, concatenated end to end. If a


@@ -26218,7 +26663,7 @@ an identically named option for the &(smtp)& transport. In each case, the value
 of the option is expanded and must then be the name of a file that contains a
 CRL in PEM format.
 The downside is that clients have to periodically re-download a potentially huge
 of the option is expanded and must then be the name of a file that contains a
 CRL in PEM format.
 The downside is that clients have to periodically re-download a potentially huge

-file from every certificate authority the know of.
+file from every certificate authority they know of.

 
 The way with most moving parts at query time is Online Certificate
 Status Protocol (OCSP), where the client verifies the certificate
 
 The way with most moving parts at query time is Online Certificate
 Status Protocol (OCSP), where the client verifies the certificate


@@ -26328,9 +26773,15 @@ if it requests it. If the server is Exim, it will request a certificate only if
 &%tls_verify_hosts%& or &%tls_try_verify_hosts%& matches the client.
 
 If the &%tls_verify_certificates%& option is set on the &(smtp)& transport, it
 &%tls_verify_hosts%& or &%tls_try_verify_hosts%& matches the client.
 
 If the &%tls_verify_certificates%& option is set on the &(smtp)& transport, it

+specifies a collection of expected server certificates.
+.new
+These may be the system default set (depending on library version),
+.wen
+a file or,
+depnding on liibrary version, a directory,

 must name a file or,
 must name a file or,

-for OpenSSL only (not GnuTLS), a directory, that contains a collection of
-expected server certificates. The client verifies the server's certificate
+for OpenSSL only (not GnuTLS), a directory.
+The client verifies the server's certificate

 against this collection, taking into account any revoked certificates that are
 in the list defined by &%tls_crl%&.
 Failure to verify fails the TLS connection unless either of the
 against this collection, taking into account any revoked certificates that are
 in the list defined by &%tls_crl%&.
 Failure to verify fails the TLS connection unless either of the


@@ -26440,7 +26891,7 @@ during TLS session handshake, to permit alternative values to be chosen:
 &%tls_verify_certificates%&
 .next
 .vindex "&%tls_ocsp_file%&"
 &%tls_verify_certificates%&
 .next
 .vindex "&%tls_ocsp_file%&"

-&%tls_verify_certificates%&
+&%tls_ocsp_file%&

 .endlist
 
 Great care should be taken to deal with matters of case, various injection
 .endlist
 
 Great care should be taken to deal with matters of case, various injection


@@ -26799,6 +27250,7 @@ This ACL is evaluated after &%acl_smtp_dkim%& but before &%acl_smtp_data%&.
 
 
 .section "The SMTP PRDR ACL" "SECTPRDRACL"
 
 
 .section "The SMTP PRDR ACL" "SECTPRDRACL"

+.cindex "PRDR" "ACL for"

 .oindex "&%prdr_enable%&"
 The &%acl_smtp_data_prdr%& ACL is available only when Exim is compiled
 with PRDR support enabled (which is the default).
 .oindex "&%prdr_enable%&"
 The &%acl_smtp_data_prdr%& ACL is available only when Exim is compiled
 with PRDR support enabled (which is the default).


@@ -26807,8 +27259,9 @@ client and server for a message, and more than one recipient
 has been accepted.
 
 The ACL test specfied by &%acl_smtp_data_prdr%& happens after a message
 has been accepted.
 
 The ACL test specfied by &%acl_smtp_data_prdr%& happens after a message

-has been recieved, and is executed for each recipient of the message.
-The test may accept or deny for inividual recipients.
+has been recieved, and is executed once for each recipient of the message
+with &$local_part$& and &$domain$& valid.
+The test may accept, defer or deny for inividual recipients.

 The &%acl_smtp_data%& will still be called after this ACL and
 can reject the message overall, even if this ACL has accepted it
 for some or all recipients.
 The &%acl_smtp_data%& will still be called after this ACL and
 can reject the message overall, even if this ACL has accepted it
 for some or all recipients.


@@ -26832,8 +27285,8 @@ the feature was not requested by the client.
 .cindex "QUIT, ACL for"
 The ACL for the SMTP QUIT command is anomalous, in that the outcome of the ACL
 does not affect the response code to QUIT, which is always 221. Thus, the ACL
 .cindex "QUIT, ACL for"
 The ACL for the SMTP QUIT command is anomalous, in that the outcome of the ACL
 does not affect the response code to QUIT, which is always 221. Thus, the ACL

-does not in fact control any access. For this reason, the only verbs that are
-permitted are &%accept%& and &%warn%&.
+does not in fact control any access. For this reason, it may only accept
+or warn as its final result.

 
 This ACL can be used for tasks such as custom logging at the end of an SMTP
 session. For example, you can use ACL variables in other ACLs to count
 
 This ACL can be used for tasks such as custom logging at the end of an SMTP
 session. For example, you can use ACL variables in other ACLs to count


@@ -27637,10 +28090,8 @@ anyway. If the message contains newlines, this gives rise to a multi-line SMTP
 response.
 
 .vindex "&$acl_verify_message$&"
 response.
 
 .vindex "&$acl_verify_message$&"

-.new

 For ACLs that are called by an &%acl =%& ACL condition, the message is
 stored in &$acl_verify_message$&, from which the calling ACL may use it.
 For ACLs that are called by an &%acl =%& ACL condition, the message is
 stored in &$acl_verify_message$&, from which the calling ACL may use it.

-.wen

 
 If &%message%& is used on a statement that verifies an address, the message
 specified overrides any message that is generated by the verification process.
 
 If &%message%& is used on a statement that verifies an address, the message
 specified overrides any message that is generated by the verification process.


@@ -27749,10 +28200,20 @@ is what is wanted for subsequent tests.
 .cindex "&ACL;" "cutthrough routing"
 .cindex "cutthrough" "requesting"
 This option requests delivery be attempted while the item is being received.
 .cindex "&ACL;" "cutthrough routing"
 .cindex "cutthrough" "requesting"
 This option requests delivery be attempted while the item is being received.

-It is usable in the RCPT ACL and valid only for single-recipient mails forwarded
-from one SMTP connection to another.  If a recipient-verify callout connection is
-requested in the same ACL it is held open and used for the data, otherwise one is made
-after the ACL completes.
+
+The option is usable in the RCPT ACL.
+If enabled for a message recieved via smtp and routed to an smtp transport,
+and only one transport, interface, destination host and port combination
+is used for all recipients of the message,
+then the delivery connection is made while the receiving connection is open
+and data is copied from one to the other.
+
+An attempt to set this option for any recipient but the first
+for a mail will be quietly ignored.
+If a recipient-verify callout connection is subsequently
+requested in the same ACL it is held open and used for
+any subsequent receipients and the data,
+otherwise one is made after the initial RCPT ACL completes.

 
 Note that routers are used in verify mode,
 and cannot depend on content of received headers.
 
 Note that routers are used in verify mode,
 and cannot depend on content of received headers.


@@ -27763,15 +28224,17 @@ Headers may be modified by routers (subject to the above) and transports.
 Cutthrough delivery is not supported via transport-filters or when DKIM signing
 of outgoing messages is done, because it sends data to the ultimate destination
 before the entire message has been received from the source.
 Cutthrough delivery is not supported via transport-filters or when DKIM signing
 of outgoing messages is done, because it sends data to the ultimate destination
 before the entire message has been received from the source.

+It is not supported for messages recieved with the SMTP PRDR option in use.

 
 Should the ultimate destination system positively accept or reject the mail,
 a corresponding indication is given to the source system and nothing is queued.
 If there is a temporary error the item is queued for later delivery in the
 
 Should the ultimate destination system positively accept or reject the mail,
 a corresponding indication is given to the source system and nothing is queued.
 If there is a temporary error the item is queued for later delivery in the

-usual fashion. If the item is successfully delivered in cutthrough mode the log line
-is tagged with ">>" rather than "=>" and appears before the acceptance "<="
-line.
+usual fashion. If the item is successfully delivered in cutthrough mode
+the delivery log lines are tagged with ">>" rather than "=>" and appear
+before the acceptance "<=" line.

 
 

-Delivery in this mode avoids the generation of a bounce mail to a (possibly faked)
+Delivery in this mode avoids the generation of a bounce mail to a
+(possibly faked)

 sender when the destination system is doing content-scan based rejection.
 
 
 sender when the destination system is doing content-scan based rejection.
 
 


@@ -28216,6 +28679,8 @@ can be appended; they appear within the called ACL in $acl_arg1 to $acl_arg9,
 and $acl_narg is set to the count of values.
 Previous values of these variables are restored after the call returns.
 The name and values are expanded separately.
 and $acl_narg is set to the count of values.
 Previous values of these variables are restored after the call returns.
 The name and values are expanded separately.

+Note that spaces in complex expansions which are used as arguments
+will act as argument separators.

 
 If the nested &%acl%& returns &"drop"& and the outer condition denies access,
 the connection is dropped. If it returns &"discard"&, the verb must be
 
 If the nested &%acl%& returns &"drop"& and the outer condition denies access,
 the connection is dropped. If it returns &"discard"&, the verb must be


@@ -28557,7 +29022,7 @@ verified is redirected to a single address, verification continues with the new
 address, and in that case, the subsequent value of &$address_data$& is the
 value for the child address.
 
 address, and in that case, the subsequent value of &$address_data$& is the
 value for the child address.
 

-.vitem &*verify&~=&~reverse_host_lookup*&
+.vitem &*verify&~=&~reverse_host_lookup/*&<&'options'&>

 .cindex "&%verify%& ACL condition"
 .cindex "&ACL;" "verifying host reverse lookup"
 .cindex "host" "verifying reverse lookup"
 .cindex "&%verify%& ACL condition"
 .cindex "&ACL;" "verifying host reverse lookup"
 .cindex "host" "verifying reverse lookup"


@@ -28568,6 +29033,9 @@ Verification ensures that the host name obtained from a reverse DNS lookup, or
 one of its aliases, does, when it is itself looked up in the DNS, yield the
 original IP address.
 
 one of its aliases, does, when it is itself looked up in the DNS, yield the
 original IP address.
 

+There is one possible option, &`defer_ok`&.  If this is present and a
+DNS operation returns a temporary error, the verify condition succeeds.
+

 If this condition is used for a locally generated message (that is, when there
 is no client host involved), it always succeeds.
 
 If this condition is used for a locally generated message (that is, when there
 is no client host involved), it always succeeds.
 


@@ -30115,10 +30583,14 @@ It supports a &"generic"& interface to scanners called via the shell, and
 specialized interfaces for &"daemon"& type virus scanners, which are resident
 in memory and thus are much faster.
 
 specialized interfaces for &"daemon"& type virus scanners, which are resident
 in memory and thus are much faster.
 

+.new
+A timeout of 2 minutes is applied to a scanner call (by default);
+if it expires then a defer action is taken.
+.wen

 
 .oindex "&%av_scanner%&"
 
 .oindex "&%av_scanner%&"

-You can set the &%av_scanner%& option in first part of the Exim configuration
-file to specify which scanner to use, together with any additional options that
+You can set the &%av_scanner%& option in the main part of the configuration
+to specify which scanner to use, together with any additional options that

 are needed. The basic syntax is as follows:
 .display
 &`av_scanner = <`&&'scanner-type'&&`>:<`&&'option1'&&`>:<`&&'option2'&&`>:[...]`&
 are needed. The basic syntax is as follows:
 .display
 &`av_scanner = <`&&'scanner-type'&&`>:<`&&'option1'&&`>:<`&&'option2'&&`>:[...]`&


@@ -30133,6 +30605,41 @@ The usual list-parsing of the content (see &<<SECTlistconstruct>>&) applies.
 The following scanner types are supported in this release:
 
 .vlist
 The following scanner types are supported in this release:
 
 .vlist

+.new
+.vitem &%avast%&
+.cindex "virus scanners" "avast"
+This is the scanner daemon of Avast. It has been tested with Avast Core
+Security (currenty at version 1.1.7).
+You can get a trial version at &url(http://www.avast.com) or for Linux
+at &url(http://www.avast.com/linux-server-antivirus).
+This scanner type takes one option,
+which can be either a full path to a UNIX socket,
+or host and port specifiers separated by white space.
+The host may be a name or an IP address; the port is either a
+single number or a pair of numbers with a dash between.
+Any further options are given, on separate lines,
+to the daemon as options before the main scan command.
+For example:
+.code
+av_scanner = avast:/var/run/avast/scan.sock:FLAGS -fullfiles:SENSITIVITY -pup
+av_scanner = avast:192.168.2.22 5036
+.endd
+If you omit the argument, the default path
+&_/var/run/avast/scan.sock_&
+is used.
+If you use a remote host,
+you need to make Exim's spool directory available to it,
+as the scanner is passed a file path, not file contents.
+For information about available commands and their options you may use 
+.code
+$ socat UNIX:/var/run/avast/scan.sock STDIO:
+    FLAGS
+    SENSITIVITY
+    PACK
+.endd
+.wen
+
+

 .vitem &%aveserver%&
 .cindex "virus scanners" "Kaspersky"
 This is the scanner daemon of Kaspersky Version 5. You can get a trial version
 .vitem &%aveserver%&
 .cindex "virus scanners" "Kaspersky"
 This is the scanner daemon of Kaspersky Version 5. You can get a trial version


@@ -30149,17 +30656,39 @@ av_scanner = aveserver:/var/run/aveserver
 This daemon-type scanner is GPL and free. You can get it at
 &url(http://www.clamav.net/). Some older versions of clamd do not seem to
 unpack MIME containers, so it used to be recommended to unpack MIME attachments
 This daemon-type scanner is GPL and free. You can get it at
 &url(http://www.clamav.net/). Some older versions of clamd do not seem to
 unpack MIME containers, so it used to be recommended to unpack MIME attachments

-in the MIME ACL. This no longer believed to be necessary. One option is
-required: either the path and name of a UNIX socket file, or a hostname or IP
-number, and a port, separated by space, as in the second of these examples:
+in the MIME ACL. This is no longer believed to be necessary.
+
+The options are a list of server specifiers, which may be
+a UNIX socket specification,
+a TCP socket specification,
+or a (global) option.
+
+A socket specification consists of a space-separated list.
+For a Unix socket the first element is a full path for the socket,
+for a TCP socket the first element is the IP address
+and the second a port number,
+Any further elements are per-server (non-global) options.
+These per-server options are supported:
+.code
+retry=<timespec>       Retry on connect fail
+.endd
+
+The &`retry`& option specifies a time after which a single retry for
+a failed connect is made.  The default is to not retry.
+
+If a Unix socket file is specified, only one server is supported.
+
+Examples:

 .code
 av_scanner = clamd:/opt/clamd/socket
 av_scanner = clamd:192.0.2.3 1234
 av_scanner = clamd:192.0.2.3 1234:local
 .code
 av_scanner = clamd:/opt/clamd/socket
 av_scanner = clamd:192.0.2.3 1234
 av_scanner = clamd:192.0.2.3 1234:local

+av_scanner = clamd:192.0.2.3 1234 retry=10s

 av_scanner = clamd:192.0.2.3 1234 : 192.0.2.4 1234
 .endd
 av_scanner = clamd:192.0.2.3 1234 : 192.0.2.4 1234
 .endd

-If the value of av_scanner points to a UNIX socket file or contains the local
-keyword, then the ClamAV interface will pass a filename containing the data
+If the value of av_scanner points to a UNIX socket file or contains the
+&`local`&
+option, then the ClamAV interface will pass a filename containing the data

 to be scanned, which will should normally result in less I/O happening and be
 more efficient.  Normally in the TCP case, the data is streamed to ClamAV as
 Exim does not assume that there is a common filesystem with the remote host.
 to be scanned, which will should normally result in less I/O happening and be
 more efficient.  Normally in the TCP case, the data is streamed to ClamAV as
 Exim does not assume that there is a common filesystem with the remote host.


@@ -30221,9 +30750,13 @@ av_scanner = cmdline:\
 .endd
 .vitem &%drweb%&
 .cindex "virus scanners" "DrWeb"
 .endd
 .vitem &%drweb%&
 .cindex "virus scanners" "DrWeb"

-The DrWeb daemon scanner (&url(http://www.sald.com/)) interface takes one
-argument, either a full path to a UNIX socket, or an IP address and port
-separated by white space, as in these examples:
+The DrWeb daemon scanner (&url(http://www.sald.com/)) interface
+takes one option,
+either a full path to a UNIX socket,
+or host and port specifiers separated by white space.
+The host may be a name or an IP address; the port is either a
+single number or a pair of numbers with a dash between.
+For example:

 .code
 av_scanner = drweb:/var/run/drwebd.sock
 av_scanner = drweb:192.168.2.20 31337
 .code
 av_scanner = drweb:/var/run/drwebd.sock
 av_scanner = drweb:192.168.2.20 31337


@@ -30231,6 +30764,17 @@ av_scanner = drweb:192.168.2.20 31337
 If you omit the argument, the default path &_/usr/local/drweb/run/drwebd.sock_&
 is used. Thanks to Alex Miller for contributing the code for this scanner.
 
 If you omit the argument, the default path &_/usr/local/drweb/run/drwebd.sock_&
 is used. Thanks to Alex Miller for contributing the code for this scanner.
 

+.vitem &%f-protd%&
+.cindex "virus scanners" "f-protd"
+The f-protd scanner is accessed via HTTP over TCP.
+One argument is taken, being a space-separated hostname and port number
+(or port-range).
+For example:
+.code
+av_scanner = f-protd:localhost 10200-10204
+.endd
+If you omit the argument, the default values show above are used.
+

 .vitem &%fsecure%&
 .cindex "virus scanners" "F-Secure"
 The F-Secure daemon scanner (&url(http://www.f-secure.com)) takes one
 .vitem &%fsecure%&
 .cindex "virus scanners" "F-Secure"
 The F-Secure daemon scanner (&url(http://www.f-secure.com)) takes one


@@ -30309,7 +30853,10 @@ which case each use of the &%malware%& condition causes a new scan of the
 message.
 
 The &%malware%& condition takes a right-hand argument that is expanded before
 message.
 
 The &%malware%& condition takes a right-hand argument that is expanded before

-use. It can then be one of
+.new
+use and taken as a list, slash-separated by default.
+.wen
+The first element can then be one of

 
 .ilist
 &"true"&, &"*"&, or &"1"&, in which case the message is scanned for viruses.
 
 .ilist
 &"true"&, &"*"&, or &"1"&, in which case the message is scanned for viruses.


@@ -30322,11 +30869,25 @@ the condition fails immediately.
 A regular expression, in which case the message is scanned for viruses. The
 condition succeeds if a virus is found and its name matches the regular
 expression. This allows you to take special actions on certain types of virus.
 A regular expression, in which case the message is scanned for viruses. The
 condition succeeds if a virus is found and its name matches the regular
 expression. This allows you to take special actions on certain types of virus.

+.new
+Note that &"/"& characters in the RE must be doubled due to the list-processing,
+unless the separator is changed (in the usual way).
+.wen

 .endlist
 
 .endlist
 

-You can append &`/defer_ok`& to the &%malware%& condition to accept messages
-even if there is a problem with the virus scanner. Otherwise, such a problem
-causes the ACL to defer.
+You can append a &`defer_ok`& element to the &%malware%& argument list to accept
+messages even if there is a problem with the virus scanner.
+Otherwise, such a problem causes the ACL to defer.
+
+.new
+You can append a &`tmo=<val>`& element to the &%malware%& argument list to
+specify a non-default timeout.  The default is two minutes.
+For example:
+.code
+malware = * / defer_ok / tmo=10s
+.endd
+A timeout causes the ACL to defer.
+.wen

 
 .vindex "&$malware_name$&"
 When a virus is found, the condition sets up an expansion variable called
 
 .vindex "&$malware_name$&"
 When a virus is found, the condition sets up an expansion variable called


@@ -30370,14 +30931,22 @@ deny message = This message contains malware ($malware_name)
 .endd
 
 
 .endd
 
 

-.section "Scanning with SpamAssassin" "SECTscanspamass"
+.section "Scanning with SpamAssassin and Rspamd" "SECTscanspamass"

 .cindex "content scanning" "for spam"
 .cindex "spam scanning"
 .cindex "SpamAssassin"
 .cindex "content scanning" "for spam"
 .cindex "spam scanning"
 .cindex "SpamAssassin"

+.cindex "Rspamd"

 The &%spam%& ACL condition calls SpamAssassin's &%spamd%& daemon to get a spam
 The &%spam%& ACL condition calls SpamAssassin's &%spamd%& daemon to get a spam

-score and a report for the message. You can get SpamAssassin at
-&url(http://www.spamassassin.org), or, if you have a working Perl
-installation, you can use CPAN by running:
+score and a report for the message.
+.new
+Support is also provided for Rspamd.
+
+For more information about installation and configuration of SpamAssassin or 
+Rspamd refer to their respective websites at
+&url(http://spamassassin.apache.org) and &url(http://www.rspamd.com)
+.wen
+
+SpamAssassin can be installed with CPAN by running:

 .code
 perl -MCPAN -e 'install Mail::SpamAssassin'
 .endd
 .code
 perl -MCPAN -e 'install Mail::SpamAssassin'
 .endd


@@ -30386,36 +30955,90 @@ documentation to see how you can tweak it. The default installation should work
 nicely, however.
 
 .oindex "&%spamd_address%&"
 nicely, however.
 
 .oindex "&%spamd_address%&"

-After having installed and configured SpamAssassin, start the &%spamd%& daemon.
-By default, it listens on 127.0.0.1, TCP port 783. If you use another host or
-port for &%spamd%&, you must set the &%spamd_address%& option in the global
-part of the Exim configuration as follows (example):
+By default, SpamAssassin listens on 127.0.0.1, TCP port 783 and if you 
+intend to use an instance running on the local host you do not need to set
+&%spamd_address%&. If you intend to use another host or port for SpamAssassin,
+you must set the &%spamd_address%& option in the global part of the Exim
+configuration as follows (example):

 .code
 spamd_address = 192.168.99.45 387
 .endd
 .code
 spamd_address = 192.168.99.45 387
 .endd

-You do not need to set this option if you use the default. As of version 2.60,
-&%spamd%& also supports communication over UNIX sockets. If you want to use
-these, supply &%spamd_address%& with an absolute file name instead of a
-address/port pair:
+
+.new
+To use Rspamd (which by default listens on all local addresses
+on TCP port 11333)
+you should add &%variant=rspamd%& after the address/port pair, for example:
+.code
+spamd_address = 127.0.0.1 11333 variant=rspamd
+.endd
+.wen
+
+As of version 2.60, &%SpamAssassin%& also supports communication over UNIX
+sockets. If you want to us these, supply &%spamd_address%& with an absolute
+file name instead of an address/port pair:

 .code
 spamd_address = /var/run/spamd_socket
 .endd
 You can have multiple &%spamd%& servers to improve scalability. These can
 reside on other hardware reachable over the network. To specify multiple
 &%spamd%& servers, put multiple address/port pairs in the &%spamd_address%&
 .code
 spamd_address = /var/run/spamd_socket
 .endd
 You can have multiple &%spamd%& servers to improve scalability. These can
 reside on other hardware reachable over the network. To specify multiple
 &%spamd%& servers, put multiple address/port pairs in the &%spamd_address%&

-option, separated with colons:
+option, separated with colons (the separator can be changed in the usual way):

 .code
 spamd_address = 192.168.2.10 783 : \
                 192.168.2.11 783 : \
                 192.168.2.12 783
 .endd
 .code
 spamd_address = 192.168.2.10 783 : \
                 192.168.2.11 783 : \
                 192.168.2.12 783
 .endd

-Up to 32 &%spamd%& servers are supported. The servers are queried in a random
-fashion. When a server fails to respond to the connection attempt, all other
+Up to 32 &%spamd%& servers are supported.
+When a server fails to respond to the connection attempt, all other

 servers are tried until one succeeds. If no server responds, the &%spam%&
 condition defers.
 
 servers are tried until one succeeds. If no server responds, the &%spam%&
 condition defers.
 

-&*Warning*&: It is not possible to use the UNIX socket connection method with
-multiple &%spamd%& servers.
+.new
+Unix and TCP socket specifications may be mixed in any order.
+Each element of the list is a list itself, space-separated by default
+and changeable in the usual way.
+
+For TCP socket specifications a host name or IP (v4 or v6, but
+subject to list-separator quoting rules) address can be used,
+and the port can be one or a dash-separated pair.
+In the latter case, the range is tried in strict order.
+
+Elements after the first for Unix sockets, or second for TCP socket,
+are options.
+The supported option are:
+.code
+pri=<priority>      Selection priority
+weight=<value>      Selection bias
+time=<start>-<end>  Use only between these times of day
+retry=<timespec>    Retry on connect fail
+tmo=<timespec>      Connection time limit
+variant=rspamd      Use Rspamd rather than SpamAssassin protocol
+.endd
+
+The &`pri`& option specifies a priority for the server within the list,
+higher values being tried first.
+The deafult priority is 1.
+
+The &`weight`& option specifies a selection bias.
+Within a priority set
+servers are queried in a random fashion, weighted by this value.
+The default value for selection bias is 1.
+
+Time specifications for the &`time`& option are <hour>.<minute>.<second>
+in the local time zone; each element being one or more digits.
+Either the seconds or both minutes and seconds, plus the leading &`.`&
+characters, may be omitted and will be taken as zero.
+
+Timeout specifications for the &`retry`& and &`tmo`& options
+are the usual Exim time interval standard, eg. &`20s`& or &`1m`&.
+
+The &`tmo`& option specifies an overall timeout for communication.
+The default value is two minutes.
+
+The &`retry`& option specifies a time after which a single retry for
+a failed connect is made.
+The default is to not retry.
+.wen

 
 The &%spamd_address%& variable is expanded before use if it starts with
 a dollar sign. In this case, the expansion may return a string that is
 
 The &%spamd_address%& variable is expanded before use if it starts with
 a dollar sign. In this case, the expansion may return a string that is


@@ -30432,7 +31055,10 @@ The right-hand side of the &%spam%& condition specifies a name. This is
 relevant if you have set up multiple SpamAssassin profiles. If you do not want
 to scan using a specific profile, but rather use the SpamAssassin system-wide
 default profile, you can scan for an unknown name, or simply use &"nobody"&.
 relevant if you have set up multiple SpamAssassin profiles. If you do not want
 to scan using a specific profile, but rather use the SpamAssassin system-wide
 default profile, you can scan for an unknown name, or simply use &"nobody"&.

-However, you must put something on the right-hand side.
+.new
+Rspamd does not use this setting. However, you must put something on the
+right-hand side.
+.wen

 
 The name allows you to use per-domain or per-user antispam profiles in
 principle, but this is not straightforward in practice, because a message may
 
 The name allows you to use per-domain or per-user antispam profiles in
 principle, but this is not straightforward in practice, because a message may


@@ -30440,6 +31066,12 @@ have multiple recipients, not necessarily all in the same domain. Because the
 &%spam%& condition has to be called from a DATA ACL in order to be able to
 read the contents of the message, the variables &$local_part$& and &$domain$&
 are not set.
 &%spam%& condition has to be called from a DATA ACL in order to be able to
 read the contents of the message, the variables &$local_part$& and &$domain$&
 are not set.

+Careful enforcement of single-recipient messages
+(eg. by responding with defer in the recipient ACL for all recipients
+after the first),
+or the use of PRDR,
+.cindex "PRDR" "use for per-user SpamAssassin profiles"
+are needed to use this feature.

 
 The right-hand side of the &%spam%& condition is expanded before being used, so
 you can put lookups or conditions there. When the right-hand side evaluates to
 
 The right-hand side of the &%spam%& condition is expanded before being used, so
 you can put lookups or conditions there. When the right-hand side evaluates to


@@ -30486,6 +31118,14 @@ headers, since MUAs can match on such strings.
 .vitem &$spam_report$&
 A multiline text table, containing the full SpamAssassin report for the
 message. Useful for inclusion in headers or reject messages.
 .vitem &$spam_report$&
 A multiline text table, containing the full SpamAssassin report for the
 message. Useful for inclusion in headers or reject messages.

+
+.new
+.vitem &$spam_action$&
+For SpamAssassin either 'reject' or 'no action' depending on the
+spam score versus threshold.
+For Rspamd, the recommended action.
+.wen
+

 .endlist
 
 The &%spam%& condition caches its results unless expansion in
 .endlist
 
 The &%spam%& condition caches its results unless expansion in


@@ -30671,7 +31311,8 @@ containing the decoded data.
 This is perhaps the most important of the MIME variables. It contains a
 proposed filename for an attachment, if one was found in either the
 &'Content-Type:'& or &'Content-Disposition:'& headers. The filename will be
 This is perhaps the most important of the MIME variables. It contains a
 proposed filename for an attachment, if one was found in either the
 &'Content-Type:'& or &'Content-Disposition:'& headers. The filename will be

-RFC2047 decoded, but no additional sanity checks are done. If no filename was
+RFC2047 or RFC2231 decoded, but no additional sanity checks are done.
+ If no filename was

 found, this variable contains the empty string.
 
 .vitem &$mime_is_coverletter$&
 found, this variable contains the empty string.
 
 .vitem &$mime_is_coverletter$&


@@ -32429,6 +33070,9 @@ headers_remove = return-receipt-to:acknowledge-to
 Multiple &%headers_remove%& options for a single router or transport can be
 specified; the arguments will append to a single header-names list.
 Each item is separately expanded.
 Multiple &%headers_remove%& options for a single router or transport can be
 specified; the arguments will append to a single header-names list.
 Each item is separately expanded.

+Note that colons in complex expansions which are used to
+form all or part of a &%headers_remove%& list
+will act as list separators.

 
 When &%headers_add%& or &%headers_remove%& is specified on a router,
 items are expanded at routing time,
 
 When &%headers_add%& or &%headers_remove%& is specified on a router,
 items are expanded at routing time,


@@ -33266,13 +33910,10 @@ failing addresses with their error messages.
 The third item is used to introduce any text from pipe transports that is to be
 returned to the sender. It is omitted if there is no such text.
 .next
 The third item is used to introduce any text from pipe transports that is to be
 returned to the sender. It is omitted if there is no such text.
 .next

-The fourth item is used to introduce the copy of the message that is returned
-as part of the error report.
-.next
-The fifth item is added after the fourth one if the returned message is
-truncated because it is bigger than &%return_size_limit%&.
-.next
-The sixth item is added after the copy of the original message.
+.new
+The fourth, fifth and sixth items will be ignored and may be empty.
+The fields exist for back-compatibility
+.wen

 .endlist
 
 The default state (&%bounce_message_file%& unset) is equivalent to the
 .endlist
 
 The default state (&%bounce_message_file%& unset) is equivalent to the


@@ -34109,8 +34750,9 @@ equivalent to the setting:
 .code
 log_file_path = $spool_directory/log/%slog
 .endd
 .code
 log_file_path = $spool_directory/log/%slog
 .endd

-If you do not specify anything at build time or run time, that is where the
-logs are written.
+If you do not specify anything at build time or run time,
+or if you unset the option at run time (i.e. &`log_file_path = `&),
+that is where the logs are written.

 
 A log file path may also contain &`%D`& or &`%M`& if datestamped log file names
 are in use &-- see section &<<SECTdatlogfil>>& below.
 
 A log file path may also contain &`%D`& or &`%M`& if datestamped log file names
 are in use &-- see section &<<SECTdatlogfil>>& below.


@@ -34610,8 +35252,8 @@ selection marked by asterisks:
 &`*etrn                       `&  ETRN commands
 &`*host_lookup_failed         `&  as it says
 &` ident_timeout              `&  timeout for ident connection
 &`*etrn                       `&  ETRN commands
 &`*host_lookup_failed         `&  as it says
 &` ident_timeout              `&  timeout for ident connection

-&` incoming_interface         `&  incoming interface on <= lines
-&` incoming_port              `&  incoming port on <= lines
+&` incoming_interface         `&  local interface on <= and => lines
+&` incoming_port              `&  remote port on <= lines

 &`*lost_incoming_connection   `&  as it says (includes timeouts)
 &` outgoing_port              `&  add remote port to => lines
 &`*queue_run                  `&  start and end queue runs
 &`*lost_incoming_connection   `&  as it says (includes timeouts)
 &` outgoing_port              `&  add remote port to => lines
 &`*queue_run                  `&  start and end queue runs


@@ -34635,7 +35277,9 @@ selection marked by asterisks:
 &` smtp_protocol_error        `&  SMTP protocol errors
 &` smtp_syntax_error          `&  SMTP syntax errors
 &` subject                    `&  contents of &'Subject:'& on <= lines
 &` smtp_protocol_error        `&  SMTP protocol errors
 &` smtp_syntax_error          `&  SMTP syntax errors
 &` subject                    `&  contents of &'Subject:'& on <= lines

-&` tls_certificate_verified   `&  certificate verification status
+.new
+&`*tls_certificate_verified   `&  certificate verification status
+.wen

 &`*tls_cipher                 `&  TLS cipher suite on <= and => lines
 &` tls_peerdn                 `&  TLS peer DN on <= and => lines
 &` tls_sni                    `&  TLS SNI on <= lines
 &`*tls_cipher                 `&  TLS cipher suite on <= and => lines
 &` tls_peerdn                 `&  TLS peer DN on <= and => lines
 &` tls_sni                    `&  TLS SNI on <= lines


@@ -34728,12 +35372,16 @@ routing email addresses, but it does apply to &"byname"& lookups.
 client's ident port times out.
 .next
 .cindex "log" "incoming interface"
 client's ident port times out.
 .next
 .cindex "log" "incoming interface"

+.cindex "log" "local interface"
+.cindex "log" "local address and port"
+.cindex "TCP/IP" "logging local address and port"

 .cindex "interface" "logging"
 &%incoming_interface%&: The interface on which a message was received is added
 to the &"<="& line as an IP address in square brackets, tagged by I= and
 followed by a colon and the port number. The local interface and port are also
 .cindex "interface" "logging"
 &%incoming_interface%&: The interface on which a message was received is added
 to the &"<="& line as an IP address in square brackets, tagged by I= and
 followed by a colon and the port number. The local interface and port are also

-added to other SMTP log lines, for example &"SMTP connection from"&, and to
-rejection lines.
+added to other SMTP log lines, for example &"SMTP connection from"& and to
+rejection lines
+and (despite the name) the local interface is added to &"=>"& lines..

 .next
 .cindex "log" "incoming remote port"
 .cindex "port" "logging remote"
 .next
 .cindex "log" "incoming remote port"
 .cindex "port" "logging remote"


@@ -35183,7 +35831,7 @@ The input files can be in Exim log format or syslog format.
 If a matching log line is not associated with a specific message, it is
 included in &'exigrep'&'s output without any additional lines. The usage is:
 .display
 If a matching log line is not associated with a specific message, it is
 included in &'exigrep'&'s output without any additional lines. The usage is:
 .display

-&`exigrep [-t<`&&'n'&&`>] [-I] [-l] [-v] <`&&'pattern'&&`> [<`&&'log file'&&`>] ...`&
+&`exigrep [-t<`&&'n'&&`>] [-I] [-l] [-M] [-v] <`&&'pattern'&&`> [<`&&'log file'&&`>] ...`&

 .endd
 If no log file names are given on the command line, the standard input is read.
 
 .endd
 If no log file names are given on the command line, the standard input is read.
 


@@ -35204,9 +35852,24 @@ regular expression.
 The &%-v%& option inverts the matching condition. That is, a line is selected
 if it does &'not'& match the pattern.
 
 The &%-v%& option inverts the matching condition. That is, a line is selected
 if it does &'not'& match the pattern.
 

+The &%-M%& options means &"related messages"&. &'exigrep'& will show messages
+that are generated as a result/response to a message that &'exigrep'& matched
+normally.
+
+Example of &%-M%&:
+user_a sends a message to user_b, which generates a bounce back to user_b. If
+&'exigrep'& is used to search for &"user_a"&, only the first message will be
+displayed.  But if &'exigrep'& is used to search for &"user_b"&, the first and
+the second (bounce) message will be displayed. Using &%-M%& with &'exigrep'&
+when searching for &"user_a"& will show both messages since the bounce is
+&"related"& to or a &"result"& of the first message that was found by the
+search term.
+

 If the location of a &'zcat'& command is known from the definition of
 ZCAT_COMMAND in &_Local/Makefile_&, &'exigrep'& automatically passes any file
 whose name ends in COMPRESS_SUFFIX through &'zcat'& as it searches it.
 If the location of a &'zcat'& command is known from the definition of
 ZCAT_COMMAND in &_Local/Makefile_&, &'exigrep'& automatically passes any file
 whose name ends in COMPRESS_SUFFIX through &'zcat'& as it searches it.

+If the ZCAT_COMMAND is not executable, &'exigrep'& tries to use
+autodetection of some well known compression extensions.

 
 
 .section "Selecting messages by various criteria (exipick)" "SECTexipick"
 
 
 .section "Selecting messages by various criteria (exipick)" "SECTexipick"