Fix bug 1267 - inlist/i were ignoring negation.

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

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index b650fc39fa6d47d22f013fb99d0cde49802c05c1..eb359d0882783ac5e0937c870e652be0f99ed7ec 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -45,7 +45,7 @@
 . the <bookinfo> element must also be updated for each new edition.
 . /////////////////////////////////////////////////////////////////////////////
 
 . the <bookinfo> element must also be updated for each new edition.
 . /////////////////////////////////////////////////////////////////////////////
 

-.set previousversion "4.75"
+.set previousversion "4.80"

 .set version "4.80"
 
 .set ACL "access control lists (ACLs)"
 .set version "4.80"
 
 .set ACL "access control lists (ACLs)"


@@ -1647,7 +1647,6 @@ architecture and operating system for itself, but the defaults can be
 overridden if necessary.
 
 
 overridden if necessary.
 
 

-.new

 .section "PCRE library" "SECTpcre"
 .cindex "PCRE library"
 Exim no longer has an embedded PCRE library as the vast majority of
 .section "PCRE library" "SECTpcre"
 .cindex "PCRE library"
 Exim no longer has an embedded PCRE library as the vast majority of


@@ -1662,7 +1661,6 @@ If your operating system has no
 PCRE support then you will need to obtain and build the current PCRE
 from &url(ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/).
 More information on PCRE is available at &url(http://www.pcre.org/).
 PCRE support then you will need to obtain and build the current PCRE
 from &url(ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/).
 More information on PCRE is available at &url(http://www.pcre.org/).

-.wen

 
 .section "DBM libraries" "SECTdb"
 .cindex "DBM libraries" "discussion of"
 
 .section "DBM libraries" "SECTdb"
 .cindex "DBM libraries" "discussion of"


@@ -1873,14 +1871,12 @@ SUPPORT_TLS=yes
 TLS_LIBS=-L/usr/local/openssl/lib -lssl -lcrypto
 TLS_INCLUDE=-I/usr/local/openssl/include/
 .endd
 TLS_LIBS=-L/usr/local/openssl/lib -lssl -lcrypto
 TLS_INCLUDE=-I/usr/local/openssl/include/
 .endd

-.new

 .cindex "pkg-config" "OpenSSL"
 If you have &'pkg-config'& available, then instead you can just use:
 .code
 SUPPORT_TLS=yes
 USE_OPENSSL_PC=openssl
 .endd
 .cindex "pkg-config" "OpenSSL"
 If you have &'pkg-config'& available, then instead you can just use:
 .code
 SUPPORT_TLS=yes
 USE_OPENSSL_PC=openssl
 .endd

-.wen

 .cindex "USE_GNUTLS"
 If GnuTLS is installed, you should set
 .code
 .cindex "USE_GNUTLS"
 If GnuTLS is installed, you should set
 .code


@@ -1896,7 +1892,6 @@ USE_GNUTLS=yes
 TLS_LIBS=-L/usr/gnu/lib -lgnutls -ltasn1 -lgcrypt
 TLS_INCLUDE=-I/usr/gnu/include
 .endd
 TLS_LIBS=-L/usr/gnu/lib -lgnutls -ltasn1 -lgcrypt
 TLS_INCLUDE=-I/usr/gnu/include
 .endd

-.new

 .cindex "pkg-config" "GnuTLS"
 If you have &'pkg-config'& available, then instead you can just use:
 .code
 .cindex "pkg-config" "GnuTLS"
 If you have &'pkg-config'& available, then instead you can just use:
 .code


@@ -1904,7 +1899,6 @@ SUPPORT_TLS=yes
 USE_GNUTLS=yes
 USE_GNUTLS_PC=gnutls
 .endd
 USE_GNUTLS=yes
 USE_GNUTLS_PC=gnutls
 .endd

-.wen

 
 You do not need to set TLS_INCLUDE if the relevant directory is already
 specified in INCLUDE. Details of how to configure Exim to make use of TLS are
 
 You do not need to set TLS_INCLUDE if the relevant directory is already
 specified in INCLUDE. Details of how to configure Exim to make use of TLS are


@@ -2133,7 +2127,6 @@ files or libraries are required. When a lookup type is not included in the
 binary, attempts to configure Exim to use it cause run time configuration
 errors.
 
 binary, attempts to configure Exim to use it cause run time configuration
 errors.
 

-.new

 .cindex "pkg-config" "lookups"
 .cindex "pkg-config" "authenticators"
 Many systems now use a tool called &'pkg-config'& to encapsulate information
 .cindex "pkg-config" "lookups"
 .cindex "pkg-config" "authenticators"
 Many systems now use a tool called &'pkg-config'& to encapsulate information


@@ -2153,7 +2146,6 @@ AUTH_GSASL_PC=libgsasl
 AUTH_HEIMDAL_GSSAPI=yes
 AUTH_HEIMDAL_GSSAPI_PC=heimdal-gssapi
 .endd
 AUTH_HEIMDAL_GSSAPI=yes
 AUTH_HEIMDAL_GSSAPI_PC=heimdal-gssapi
 .endd

-.wen

 
 .cindex "Perl" "including support for"
 Exim can be linked with an embedded Perl interpreter, allowing Perl
 
 .cindex "Perl" "including support for"
 Exim can be linked with an embedded Perl interpreter, allowing Perl


@@ -2686,6 +2678,15 @@ no arguments.
 This option is an alias for &%-bV%& and causes version information to be
 displayed.
 
 This option is an alias for &%-bV%& and causes version information to be
 displayed.
 

+.new
+.vitem &%-Ac%& &&&
+       &%-Am%&
+.oindex "&%-Ac%&"
+.oindex "&%-Am%&"
+These options are used by Sendmail for selecting configuration files and are
+ignored by Exim.
+.wen
+

 .vitem &%-B%&<&'type'&>
 .oindex "&%-B%&"
 .cindex "8-bit characters"
 .vitem &%-B%&<&'type'&>
 .oindex "&%-B%&"
 .cindex "8-bit characters"


@@ -2945,6 +2946,34 @@ use the &'exim_dbmbuild'& utility, or some other means, to rebuild alias files
 if this is required. If the &%bi_command%& option is not set, calling Exim with
 &%-bi%& is a no-op.
 
 if this is required. If the &%bi_command%& option is not set, calling Exim with
 &%-bi%& is a no-op.
 

+.new
+. // Keep :help first, then the rest in alphabetical order
+.vitem &%-bI:help%&
+.oindex "&%-bI:help%&"
+.cindex "querying exim information"
+We shall provide various options starting &`-bI:`& for querying Exim for
+information.  The output of many of these will be intended for machine
+consumption.  This one is not.  The &%-bI:help%& option asks Exim for a
+synopsis of supported options beginning &`-bI:`&.  Use of any of these
+options shall cause Exim to exit after producing the requested output.
+
+.vitem &%-bI:dscp%&
+.oindex "&%-bI:dscp%&"
+.cindex "DSCP" "values"
+This option causes Exim to emit an alphabetically sorted list of all
+recognised DSCP names.
+
+.vitem &%-bI:sieve%&
+.oindex "&%-bI:sieve%&"
+.cindex "Sieve filter" "capabilities"
+This option causes Exim to emit an alphabetically sorted list of all supported
+Sieve protocol extensions on stdout, one per line.  This is anticipated to be
+useful for ManageSieve (RFC 5804) implementations, in providing that protocol's
+&`SIEVE`& capability response line.  As the precise list may depend upon
+compile-time build options, which this option will adapt to, this is the only
+way to guarantee a correct response.
+.wen
+

 .vitem &%-bm%&
 .oindex "&%-bm%&"
 .cindex "local message reception"
 .vitem &%-bm%&
 .oindex "&%-bm%&"
 .cindex "local message reception"


@@ -2991,6 +3020,26 @@ The specified sender is treated as if it were given as the argument to the
 preference to the address taken from the message. The caller of Exim must be a
 trusted user for the sender of a message to be set in this way.
 
 preference to the address taken from the message. The caller of Exim must be a
 trusted user for the sender of a message to be set in this way.
 

+.vitem &%-bmalware%&&~<&'filename'&>
+.oindex "&%-bmalware%&"
+.cindex "testing", "malware"
+.cindex "malware scan test"
+This debugging option causes Exim to scan the given file,
+using the malware scanning framework.  The option of &%av_scanner%& influences
+this option, so if &%av_scanner%&'s value is dependent upon an expansion then
+the expansion should have defaults which apply to this invocation.  ACLs are
+not invoked, so if &%av_scanner%& references an ACL variable then that variable
+will never be populated and &%-bmalware%& will fail.
+
+Exim will have changed working directory before resolving the filename, so
+using fully qualified pathnames is advisable.  Exim will be running as the Exim
+user when it tries to open the file, rather than as the invoking user.
+This option requires admin privileges.
+
+The &%-bmalware%& option will not be extended to be more generally useful,
+there are better tools for file-scanning.  This option exists to help
+administrators verify their Exim and AV scanner configuration.
+

 .vitem &%-bnq%&
 .oindex "&%-bnq%&"
 .cindex "address qualification, suppressing"
 .vitem &%-bnq%&
 .oindex "&%-bnq%&"
 .cindex "address qualification, suppressing"


@@ -3038,6 +3087,12 @@ configuration file is output.
 If a list of configuration files was supplied, the value that is output here
 is the name of the file that was actually used.
 
 If a list of configuration files was supplied, the value that is output here
 is the name of the file that was actually used.
 

+.new
+.cindex "options" "hiding name of"
+If the &%-n%& flag is given, then for most modes of &%-bP%& operation the
+name will not be output.
+.wen
+

 .cindex "daemon" "process id (pid)"
 .cindex "pid (process id)" "of daemon"
 If &%log_file_path%& or &%pid_file_path%& are given, the names of the
 .cindex "daemon" "process id (pid)"
 .cindex "pid (process id)" "of daemon"
 If &%log_file_path%& or &%pid_file_path%& are given, the names of the


@@ -3251,26 +3306,6 @@ above concerning senders and qualification do not apply. In this situation,
 Exim behaves in exactly the same way as it does when receiving a message via
 the listening daemon.
 
 Exim behaves in exactly the same way as it does when receiving a message via
 the listening daemon.
 

-.vitem &%-bmalware%&&~<&'filename'&>
-.oindex "&%-bmalware%&"
-.cindex "testing", "malware"
-.cindex "malware scan test"
-This debugging option causes Exim to scan the given file,
-using the malware scanning framework.  The option of &%av_scanner%& influences
-this option, so if &%av_scanner%&'s value is dependent upon an expansion then
-the expansion should have defaults which apply to this invocation.  ACLs are
-not invoked, so if &%av_scanner%& references an ACL variable then that variable
-will never be populated and &%-bmalware%& will fail.
-
-Exim will have changed working directory before resolving the filename, so
-using fully qualified pathnames is advisable.  Exim will be running as the Exim
-user when it tries to open the file, rather than as the invoking user.
-This option requires admin privileges.
-
-The &%-bmalware%& option will not be extended to be more generally useful,
-there are better tools for file-scanning.  This option exists to help
-administrators verify their Exim and AV scanner configuration.
-

 .vitem &%-bt%&
 .oindex "&%-bt%&"
 .cindex "testing" "addresses"
 .vitem &%-bt%&
 .oindex "&%-bt%&"
 .cindex "testing" "addresses"


@@ -3660,8 +3695,19 @@ if &%-f%& is also present, it overrides &"From&~"&.
 
 .vitem &%-G%&
 .oindex "&%-G%&"
 
 .vitem &%-G%&
 .oindex "&%-G%&"

-.cindex "Sendmail compatibility" "&%-G%& option ignored"
-This is a Sendmail option which is ignored by Exim.
+.cindex "submission fixups, suppressing (command-line)"
+.new
+This option is equivalent to an ACL applying:
+.code
+control = suppress_local_fixups
+.endd
+for every message received.  Note that Sendmail will complain about such
+bad formatting, where Exim silently just does not fix it up.  This may change
+in future.
+
+As this affects audit information, the caller must be a trusted user to use
+this option.
+.wen

 
 .vitem &%-h%&&~<&'number'&>
 .oindex "&%-h%&"
 
 .vitem &%-h%&&~<&'number'&>
 .oindex "&%-h%&"


@@ -3679,6 +3725,19 @@ line by itself should not terminate an incoming, non-SMTP message. I can find
 no documentation for this option in Solaris 2.4 Sendmail, but the &'mailx'&
 command in Solaris 2.4 uses it. See also &%-ti%&.
 
 no documentation for this option in Solaris 2.4 Sendmail, but the &'mailx'&
 command in Solaris 2.4 uses it. See also &%-ti%&.
 

+.new
+.vitem &%-L%&&~<&'tag'&>
+.oindex "&%-L%&"
+.cindex "syslog" "process name; set with flag"
+This option is equivalent to setting &%syslog_processname%& in the config
+file and setting &%log_file_path%& to &`syslog`&.
+Its use is restricted to administrators.  The configuration file has to be
+read and parsed, to determine access rights, before this is set and takes
+effect, so early configuration file errors will not honour this flag.
+
+The tag should not be longer than 32 characters.
+.wen
+

 .vitem &%-M%&&~<&'message&~id'&>&~<&'message&~id'&>&~...
 .oindex "&%-M%&"
 .cindex "forcing delivery"
 .vitem &%-M%&&~<&'message&~id'&>&~<&'message&~id'&>&~...
 .oindex "&%-M%&"
 .cindex "forcing delivery"


@@ -3919,9 +3978,9 @@ for that message.
 
 .vitem &%-n%&
 .oindex "&%-n%&"
 
 .vitem &%-n%&
 .oindex "&%-n%&"

-.cindex "Sendmail compatibility" "&%-n%& option ignored"
-This option is interpreted by Sendmail to mean &"no aliasing"&. It is ignored
-by Exim.
+This option is interpreted by Sendmail to mean &"no aliasing"&.
+For normal modes of operation, it is ignored by Exim.
+When combined with &%-bP%& it suppresses the name of an option from being output.

 
 .vitem &%-O%&&~<&'data'&>
 .oindex "&%-O%&"
 
 .vitem &%-O%&&~<&'data'&>
 .oindex "&%-O%&"


@@ -4540,6 +4599,13 @@ AIX uses &%-x%& for a private purpose (&"mail from a local mail program has
 National Language Support extended characters in the body of the mail item"&).
 It sets &%-x%& when calling the MTA from its &%mail%& command. Exim ignores
 this option.
 National Language Support extended characters in the body of the mail item"&).
 It sets &%-x%& when calling the MTA from its &%mail%& command. Exim ignores
 this option.

+
+.new
+.vitem &%-X%&&~<&'logfile'&>
+.oindex "&%-X%&"
+This option is interpreted by Sendmail to cause debug information to be sent
+to the named file.  It is ignored by Exim.
+.wen

 .endlist
 
 .ecindex IIDclo1
 .endlist
 
 .ecindex IIDclo1


@@ -5303,7 +5369,7 @@ it is unset, Exim uses the &[uname()]& system function to obtain the host name.
 
 The first three non-comment configuration lines are as follows:
 .code
 
 The first three non-comment configuration lines are as follows:
 .code

-domainlist local_domains = @
+domainlist local_domains    = @

 domainlist relay_to_domains =
 hostlist   relay_from_hosts = 127.0.0.1
 .endd
 domainlist relay_to_domains =
 hostlist   relay_from_hosts = 127.0.0.1
 .endd


@@ -5645,7 +5711,7 @@ examples described in &<<SECTdefconfauth>>&. This means that no client can in
 fact authenticate until you complete the authenticator definitions.
 .code
 require message = relay not permitted
 fact authenticate until you complete the authenticator definitions.
 .code
 require message = relay not permitted

-        domains = +local_domains : +relay_domains
+        domains = +local_domains : +relay_to_domains

 .endd
 This statement rejects the address if its domain is neither a local domain nor
 one of the domains for which this host is a relay.
 .endd
 This statement rejects the address if its domain is neither a local domain nor
 one of the domains for which this host is a relay.


@@ -6007,7 +6073,7 @@ The example PLAIN authenticator looks like this:
 #  server_set_id           = $auth2
 #  server_prompts          = :
 #  server_condition        = Authentication is not yet configured
 #  server_set_id           = $auth2
 #  server_prompts          = :
 #  server_condition        = Authentication is not yet configured

-#  server_advertise_condition = ${if def:tls_cipher }
+#  server_advertise_condition = ${if def:tls_in_cipher }

 .endd
 And the example LOGIN authenticator looks like this:
 .code
 .endd
 And the example LOGIN authenticator looks like this:
 .code


@@ -6016,7 +6082,7 @@ And the example LOGIN authenticator looks like this:
 #  server_set_id           = $auth1
 #  server_prompts          = <| Username: | Password:
 #  server_condition        = Authentication is not yet configured
 #  server_set_id           = $auth1
 #  server_prompts          = <| Username: | Password:
 #  server_condition        = Authentication is not yet configured

-#  server_advertise_condition = ${if def:tls_cipher }
+#  server_advertise_condition = ${if def:tls_in_cipher }

 .endd
 
 The &%server_set_id%& option makes Exim remember the authenticated username
 .endd
 
 The &%server_set_id%& option makes Exim remember the authenticated username


@@ -6026,16 +6092,16 @@ that it implements the details of the specific authentication mechanism,
 i.e. PLAIN or LOGIN. The &%server_advertise_condition%& setting controls
 when Exim offers authentication to clients; in the examples, this is only
 when TLS or SSL has been started, so to enable the authenticators you also
 i.e. PLAIN or LOGIN. The &%server_advertise_condition%& setting controls
 when Exim offers authentication to clients; in the examples, this is only
 when TLS or SSL has been started, so to enable the authenticators you also

-need to add support for TLS as described in &<<SECTdefconfmain>>&.
+need to add support for TLS as described in section &<<SECTdefconfmain>>&.

 
 The &%server_condition%& setting defines how to verify that the username and
 password are correct. In the examples it just produces an error message.
 To make the authenticators work, you can use a string expansion
 
 The &%server_condition%& setting defines how to verify that the username and
 password are correct. In the examples it just produces an error message.
 To make the authenticators work, you can use a string expansion

-expression like one of the examples in &<<CHAPplaintext>>&.
+expression like one of the examples in chapter &<<CHAPplaintext>>&.

 
 Beware that the sequence of the parameters to PLAIN and LOGIN differ; the
 
 Beware that the sequence of the parameters to PLAIN and LOGIN differ; the

-usercode and password are in different positions.  &<<CHAPplaintext>>&
-covers both.
+usercode and password are in different positions.
+Chapter &<<CHAPplaintext>>& covers both.

 
 .ecindex IIDconfiwal
 
 
 .ecindex IIDconfiwal
 


@@ -6245,7 +6311,6 @@ using Berkeley DB versions 3 or 4, it opens existing databases for reading with
 the DB_UNKNOWN option. This enables it to handle any of the types of database
 that the library supports, and can be useful for accessing DBM files created by
 other applications. (For earlier DB versions, DB_HASH is always used.)
 the DB_UNKNOWN option. This enables it to handle any of the types of database
 that the library supports, and can be useful for accessing DBM files created by
 other applications. (For earlier DB versions, DB_HASH is always used.)

-.new

 .next
 .cindex "lookup" "dbmjz"
 .cindex "lookup" "dbm &-- embedded NULs"
 .next
 .cindex "lookup" "dbmjz"
 .cindex "lookup" "dbm &-- embedded NULs"


@@ -6257,7 +6322,6 @@ ASCII NUL characters to form the lookup key.  An example usage would be to
 authenticate incoming SMTP calls using the passwords from Cyrus SASL's
 &_/etc/sasldb2_& file with the &(gsasl)& authenticator or Exim's own
 &(cram_md5)& authenticator.
 authenticate incoming SMTP calls using the passwords from Cyrus SASL's
 &_/etc/sasldb2_& file with the &(gsasl)& authenticator or Exim's own
 &(cram_md5)& authenticator.

-.wen

 .next
 .cindex "lookup" "dbmnz"
 .cindex "lookup" "dbm &-- terminating zero"
 .next
 .cindex "lookup" "dbmnz"
 .cindex "lookup" "dbm &-- terminating zero"


@@ -6756,13 +6820,11 @@ 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.
 

-.new

 The supported DNS record types are A, CNAME, MX, NS, PTR, SPF, SRV, 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 data can be an IP address, written as normal; inversion and the addition of
 &%in-addr.arpa%& or &%ip6.arpa%& happens automatically. For example:
 The supported DNS record types are A, CNAME, MX, NS, PTR, SPF, SRV, 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 data can be an IP address, written as normal; inversion and the addition of
 &%in-addr.arpa%& or &%ip6.arpa%& happens automatically. For example:

-.wen

 .code
 ${lookup dnsdb{ptr=192.168.4.5}{$value}fail}
 .endd
 .code
 ${lookup dnsdb{ptr=192.168.4.5}{$value}fail}
 .endd


@@ -6789,15 +6851,15 @@ white space is ignored.
 
 .cindex "TXT record" "in &(dnsdb)& lookup"
 .cindex "SPF record" "in &(dnsdb)& lookup"
 
 .cindex "TXT record" "in &(dnsdb)& lookup"
 .cindex "SPF record" "in &(dnsdb)& lookup"

-.new
-For TXT and SPF records with multiple items of data, only the first item is returned,
+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
 unless a separator for them is specified using a comma after the separator

-character followed immediately by the TXT/SPF record item separator. To concatenate
-items without a separator, use a semicolon instead.
-.wen
+character followed immediately by the TXT record item separator. 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}}
 ${lookup dnsdb{>\n; txt=a.b.example}}
 .code
 ${lookup dnsdb{>\n,: txt=a.b.example}}
 ${lookup dnsdb{>\n; txt=a.b.example}}

+${lookup dnsdb{spf=example.org}}

 .endd
 It is permitted to specify a space as the separator character. Further
 white space is ignored.
 .endd
 It is permitted to specify a space as the separator character. Further
 white space is ignored.


@@ -7423,7 +7485,7 @@ ${lookup sqlite {/some/thing/sqlitedb \
 .endd
 In a list, the syntax is similar. For example:
 .code
 .endd
 In a list, the syntax is similar. For example:
 .code

-domainlist relay_domains = sqlite;/some/thing/sqlitedb \
+domainlist relay_to_domains = sqlite;/some/thing/sqlitedb \

    select * from relays where ip='$sender_host_address';
 .endd
 The only character affected by the &%quote_sqlite%& operator is a single
    select * from relays where ip='$sender_host_address';
 .endd
 The only character affected by the &%quote_sqlite%& operator is a single


@@ -7505,13 +7567,13 @@ subject is not in the set. If the end of the list is reached without the
 subject having matched any of the patterns, it is in the set if the last item
 was a negative one, but not if it was a positive one. For example, the list in
 .code
 subject having matched any of the patterns, it is in the set if the last item
 was a negative one, but not if it was a positive one. For example, the list in
 .code

-domainlist relay_domains = !a.b.c : *.b.c
+domainlist relay_to_domains = !a.b.c : *.b.c

 .endd
 matches any domain ending in &'.b.c'& except for &'a.b.c'&. Domains that match
 neither &'a.b.c'& nor &'*.b.c'& do not match, because the last item in the
 list is positive. However, if the setting were
 .code
 .endd
 matches any domain ending in &'.b.c'& except for &'a.b.c'&. Domains that match
 neither &'a.b.c'& nor &'*.b.c'& do not match, because the last item in the
 list is positive. However, if the setting were
 .code

-domainlist relay_domains = !a.b.c
+domainlist relay_to_domains = !a.b.c

 .endd
 then all domains other than &'a.b.c'& would match because the last item in the
 list is negative. In other words, a list that ends with a negative item behaves
 .endd
 then all domains other than &'a.b.c'& would match because the last item in the
 list is negative. In other words, a list that ends with a negative item behaves


@@ -7615,7 +7677,7 @@ the words &%domainlist%&, &%hostlist%&, &%addresslist%&, or &%localpartlist%&,
 respectively. Then there follows the name that you are defining, followed by an
 equals sign and the list itself. For example:
 .code
 respectively. Then there follows the name that you are defining, followed by an
 equals sign and the list itself. For example:
 .code

-hostlist    relay_hosts = 192.168.23.0/24 : my.friend.example
+hostlist    relay_from_hosts = 192.168.23.0/24 : my.friend.example

 addresslist bad_senders = cdb;/etc/badsenders
 .endd
 A named list may refer to other named lists:
 addresslist bad_senders = cdb;/etc/badsenders
 .endd
 A named list may refer to other named lists:


@@ -8696,6 +8758,23 @@ string easier to understand.
 This item inserts &"basic"& header lines. It is described with the &%header%&
 expansion item below.
 
 This item inserts &"basic"& header lines. It is described with the &%header%&
 expansion item below.
 

+
+.vitem "&*${acl{*&<&'name'&>&*}{*&<&'arg'&>&*}...}*&"
+.cindex "expansion" "calling an acl"
+.cindex "&%acl%&" "call from expansion"
+The name and zero to nine argument strings are first expanded separately.  The expanded
+arguments are assigned to the variables &$acl_arg1$& to &$acl_arg9$& in order.
+Any unused are made empty.  The variable &$acl_narg$& is set to the number of
+arguments.  The named ACL (see chapter &<<CHAPACL>>&) is called
+and may use the variables; if another acl expansion is used the values
+are overwritten.  If the ACL sets
+a value using a "message =" modifier and returns accept or deny, the value becomes
+the result of the expansion.
+If no message was set and the ACL returned accept or deny
+the value is an empty string.
+If the ACL returned defer the result is a forced-fail.  Otherwise the expansion fails.
+
+

 .vitem "&*${dlfunc{*&<&'file'&>&*}{*&<&'function'&>&*}{*&<&'arg'&>&*}&&&
        {*&<&'arg'&>&*}...}*&"
 .cindex &%dlfunc%&
 .vitem "&*${dlfunc{*&<&'file'&>&*}{*&<&'function'&>&*}{*&<&'arg'&>&*}&&&
        {*&<&'arg'&>&*}...}*&"
 .cindex &%dlfunc%&


@@ -9505,6 +9584,7 @@ environments where Exim uses base 36 instead of base 62 for its message
 identifiers, base-36 digits. The number is converted to decimal and output as a
 string.
 
 identifiers, base-36 digits. The number is converted to decimal and output as a
 string.
 

+

 .vitem &*${domain:*&<&'string'&>&*}*&
 .cindex "domain" "extraction"
 .cindex "expansion" "domain extraction"
 .vitem &*${domain:*&<&'string'&>&*}*&
 .cindex "domain" "extraction"
 .cindex "expansion" "domain extraction"


@@ -9664,6 +9744,25 @@ See the description of the general &%length%& item above for details. Note that
 when &%length%& is used as an operator.
 
 
 when &%length%& is used as an operator.
 
 

+.vitem &*${listcount:*&<&'string'&>&*}*&
+.cindex "expansion" "list item count"
+.cindex "list" "item count"
+.cindex "list" "count of items"
+.cindex "&%listcount%& expansion item"
+The string is interpreted as a list and the number of items is returned.
+
+
+.vitem &*${listnamed:*&<&'name'&>&*}*&&~and&~&*${list_*&<&'type'&>&*name'&>&*}*&
+.cindex "expansion" "named list"
+.cindex "&%listnamed%& expansion item"
+The name is interpreted as a named list and the content of the list is returned,
+expanding any referenced lists, re-quoting as needed for colon-separation.
+If the optional type if given it must be one of "a", "d", "h" or "l"
+and selects address-, domain-, host- or localpart- lists to search among respectively.
+Otherwise all types are searched in an undefined order and the first
+matching list is returned.
+
+

 .vitem &*${local_part:*&<&'string'&>&*}*&
 .cindex "expansion" "local part extraction"
 .cindex "&%local_part%& expansion item"
 .vitem &*${local_part:*&<&'string'&>&*}*&
 .cindex "expansion" "local part extraction"
 .cindex "&%local_part%& expansion item"


@@ -9771,10 +9870,8 @@ This operator returns a somewhat random number which is less than the
 supplied number and is at least 0.  The quality of this randomness depends
 on how Exim was built; the values are not suitable for keying material.
 If Exim is linked against OpenSSL then RAND_pseudo_bytes() is used.
 supplied number and is at least 0.  The quality of this randomness depends
 on how Exim was built; the values are not suitable for keying material.
 If Exim is linked against OpenSSL then RAND_pseudo_bytes() is used.

-.new

 If Exim is linked against GnuTLS then gnutls_rnd(GNUTLS_RND_NONCE) is used,
 for versions of GnuTLS with that function.
 If Exim is linked against GnuTLS then gnutls_rnd(GNUTLS_RND_NONCE) is used,
 for versions of GnuTLS with that function.

-.wen

 Otherwise, the implementation may be arc4random(), random() seeded by
 srandomdev() or srandom(), or a custom implementation even weaker than
 random().
 Otherwise, the implementation may be arc4random(), random() seeded by
 srandomdev() or srandom(), or a custom implementation even weaker than
 random().


@@ -9953,8 +10050,8 @@ ${if >{$message_size}{10M} ...
 .endd
 Note that the general negation operator provides for inequality testing. The
 two strings must take the form of optionally signed decimal integers,
 .endd
 Note that the general negation operator provides for inequality testing. The
 two strings must take the form of optionally signed decimal integers,

-optionally followed by one of the letters &"K"& or &"M"& (in either upper or
-lower case), signifying multiplication by 1024 or 1024*1024, respectively.
+optionally followed by one of the letters &"K"&, &"M"& or &"G"& (in either upper or
+lower case), signifying multiplication by 1024, 1024*1024 or 1024*1024*1024, respectively.

 As a special case, the numerical value of an empty string is taken as
 zero.
 
 As a special case, the numerical value of an empty string is taken as
 zero.
 


@@ -9963,6 +10060,21 @@ In all cases, a relative comparator OP is testing if <&'string1'&> OP
 10M, not if 10M is larger than &$message_size$&.
 
 
 10M, not if 10M is larger than &$message_size$&.
 
 

+.vitem &*acl&~{{*&<&'name'&>&*}{*&<&'arg1'&>&*}&&&
+       {*&<&'arg2'&>&*}...}*&
+.cindex "expansion" "calling an acl"
+.cindex "&%acl%&" "expansion condition"
+The name and zero to nine argument strings are first expanded separately.  The expanded
+arguments are assigned to the variables &$acl_arg1$& to &$acl_arg9$& in order.
+Any unused are made empty.  The variable &$acl_narg$& is set to the number of
+arguments.  The named ACL (see chapter &<<CHAPACL>>&) is called
+and may use the variables; if another acl expansion is used the values
+are overwritten.  If the ACL sets
+a value using a "message =" modifier the variable $value becomes
+the result of the expansion, otherwise it is empty.
+If the ACL returns accept the condition is true; if deny, false.
+If the ACL returns defer the result is a forced-fail.
+

 .vitem &*bool&~{*&<&'string'&>&*}*&
 .cindex "expansion" "boolean parsing"
 .cindex "&%bool%& expansion condition"
 .vitem &*bool&~{*&<&'string'&>&*}*&
 .cindex "expansion" "boolean parsing"
 .cindex "&%bool%& expansion condition"


@@ -10180,7 +10292,6 @@ string is lexically greater than the second string. For &%gt%& the comparison
 includes the case of letters, whereas for &%gti%& the comparison is
 case-independent.
 
 includes the case of letters, whereas for &%gti%& the comparison is
 case-independent.
 

-.new

 .vitem &*inlist&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*& &&&
        &*inlisti&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*&
 .cindex "string" "comparison"
 .vitem &*inlist&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*& &&&
        &*inlisti&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*&
 .cindex "string" "comparison"


@@ -10197,7 +10308,6 @@ ${if inlist{needle}{foo:needle:bar}}
 ${if inlisti{Needle}{fOo:NeeDLE:bAr}}
   ${if forany{fOo:NeeDLE:bAr}{eqi{$item}{Needle}}}
 .endd
 ${if inlisti{Needle}{fOo:NeeDLE:bAr}}
   ${if forany{fOo:NeeDLE:bAr}{eqi{$item}{Needle}}}
 .endd

-.wen

 
 .vitem &*isip&~{*&<&'string'&>&*}*&  &&&
        &*isip4&~{*&<&'string'&>&*}*& &&&
 
 .vitem &*isip&~{*&<&'string'&>&*}*&  &&&
        &*isip4&~{*&<&'string'&>&*}*& &&&


@@ -10309,12 +10419,10 @@ See &*match_local_part*&.
 
 .vitem &*match_ip&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*&
 .cindex "&%match_ip%& expansion condition"
 
 .vitem &*match_ip&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*&
 .cindex "&%match_ip%& expansion condition"

-.new

 This condition matches an IP address to a list of IP address patterns. It must
 be followed by two argument strings. The first (after expansion) must be an IP
 address or an empty string. The second (not expanded) is a restricted host
 list that can match only an IP address, not a host name. For example:
 This condition matches an IP address to a list of IP address patterns. It must
 be followed by two argument strings. The first (after expansion) must be an IP
 address or an empty string. The second (not expanded) is a restricted host
 list that can match only an IP address, not a host name. For example:

-.wen

 .code
 ${if match_ip{$sender_host_address}{1.2.3.4:5.6.7.8}{...}{...}}
 .endd
 .code
 ${if match_ip{$sender_host_address}{1.2.3.4:5.6.7.8}{...}{...}}
 .endd


@@ -10360,10 +10468,8 @@ just as easy to use the fact that a lookup is itself a condition, and write:
 .endd
 .endlist ilist
 
 .endd
 .endlist ilist
 

-.new

 Note that <&'string2'&> is not itself subject to string expansion, unless
 Exim was built with the EXPAND_LISTMATCH_RHS option.
 Note that <&'string2'&> is not itself subject to string expansion, unless
 Exim was built with the EXPAND_LISTMATCH_RHS option.

-.wen

 
 Consult section &<<SECThoslispatip>>& for further details of these patterns.
 
 
 Consult section &<<SECThoslispatip>>& for further details of these patterns.
 


@@ -10392,10 +10498,8 @@ item can be used, as in all address lists, to cause subsequent items to
 have their local parts matched casefully. Domains are always matched
 caselessly.
 
 have their local parts matched casefully. Domains are always matched
 caselessly.
 

-.new

 Note that <&'string2'&> is not itself subject to string expansion, unless
 Exim was built with the EXPAND_LISTMATCH_RHS option.
 Note that <&'string2'&> is not itself subject to string expansion, unless
 Exim was built with the EXPAND_LISTMATCH_RHS option.

-.wen

 
 &*Note*&: Host lists are &'not'& supported in this way. This is because
 hosts have two identities: a name and an IP address, and it is not clear
 
 &*Note*&: Host lists are &'not'& supported in this way. This is because
 hosts have two identities: a name and an IP address, and it is not clear


@@ -10742,14 +10846,12 @@ is empty and &$authentication_failed$& is set to &"1"&). Failure includes any
 negative response to an AUTH command, including (for example) an attempt to use
 an undefined mechanism.
 
 negative response to an AUTH command, including (for example) an attempt to use
 an undefined mechanism.
 

-.new

 .vitem &$av_failed$&
 .cindex "content scanning" "AV scanner failure"
 This variable is available when Exim is compiled with the content-scanning
 extension. It is set to &"0"& by default, but will be set to &"1"& if any
 problem occurs with the virus scanner (specified by &%av_scanner%&) during
 the ACL malware condition.
 .vitem &$av_failed$&
 .cindex "content scanning" "AV scanner failure"
 This variable is available when Exim is compiled with the content-scanning
 extension. It is set to &"0"& by default, but will be set to &"1"& if any
 problem occurs with the virus scanner (specified by &%av_scanner%&) during
 the ACL malware condition.

-.wen

 
 .vitem &$body_linecount$&
 .cindex "message body" "line count"
 
 .vitem &$body_linecount$&
 .cindex "message body" "line count"


@@ -11684,6 +11786,31 @@ driver that successfully authenticated the client from which the message was
 received. It is empty if there was no successful authentication. See also
 &$authenticated_id$&.
 
 received. It is empty if there was no successful authentication. See also
 &$authenticated_id$&.
 

+.new
+.vitem &$sender_host_dnssec$&
+.vindex "&$sender_host_dnssec$&"
+If &$sender_host_name$& has been populated (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
+other times, this variable is false.
+
+It is likely that you will need to coerce DNSSEC support on in the resolver
+library, by setting:
+.code
+dns_use_dnssec = 1
+.endd
+
+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.
+.wen
+
+

 .vitem &$sender_host_name$&
 .vindex "&$sender_host_name$&"
 When a message is received from a remote host, this variable contains the
 .vitem &$sender_host_name$&
 .vindex "&$sender_host_name$&"
 When a message is received from a remote host, this variable contains the


@@ -11882,22 +12009,43 @@ command in a filter file. Its use is explained in the description of that
 command, which can be found in the separate document entitled &'Exim's
 interfaces to mail filtering'&.
 
 command, which can be found in the separate document entitled &'Exim's
 interfaces to mail filtering'&.
 

-.new
-.vitem &$tls_bits$&
-.vindex "&$tls_bits$&"
-Contains an approximation of the TLS cipher's bit-strength; the meaning of
+.vitem &$tls_in_bits$&
+.vindex "&$tls_in_bits$&"
+Contains an approximation of the TLS cipher's bit-strength
+on the inbound connection; the meaning of

 this depends upon the TLS implementation used.
 If TLS has not been negotiated, the value will be 0.
 The value of this is automatically fed into the Cyrus SASL authenticator
 when acting as a server, to specify the "external SSF" (a SASL term).
 this depends upon the TLS implementation used.
 If TLS has not been negotiated, the value will be 0.
 The value of this is automatically fed into the Cyrus SASL authenticator
 when acting as a server, to specify the "external SSF" (a SASL term).

-.wen

 
 

-.vitem &$tls_certificate_verified$&
-.vindex "&$tls_certificate_verified$&"
+The deprecated &$tls_bits$& variable refers to the inbound side
+except when used in the context of an outbound SMTP delivery, when it refers to
+the outbound.
+
+.vitem &$tls_out_bits$&
+.vindex "&$tls_out_bits$&"
+Contains an approximation of the TLS cipher's bit-strength
+on an outbound SMTP connection; the meaning of
+this depends upon the TLS implementation used.
+If TLS has not been negotiated, the value will be 0.
+
+.vitem &$tls_in_certificate_verified$&
+.vindex "&$tls_in_certificate_verified$&"

 This variable is set to &"1"& if a TLS certificate was verified when the
 message was received, and &"0"& otherwise.
 
 This variable is set to &"1"& if a TLS certificate was verified when the
 message was received, and &"0"& otherwise.
 

-.vitem &$tls_cipher$&
+The deprecated &$tls_certificate_verfied$& variable refers to the inbound side
+except when used in the context of an outbound SMTP delivery, when it refers to
+the outbound.
+
+.vitem &$tls_out_certificate_verified$&
+.vindex "&$tls_out_certificate_verified$&"
+This variable is set to &"1"& if a TLS certificate was verified when an
+outbound SMTP connection was made,
+and &"0"& otherwise.
+
+.vitem &$tls_in_cipher$&
+.vindex "&$tls_in_cipher$&"

 .vindex "&$tls_cipher$&"
 When a message is received from a remote host over an encrypted SMTP
 connection, this variable is set to the cipher suite that was negotiated, for
 .vindex "&$tls_cipher$&"
 When a message is received from a remote host over an encrypted SMTP
 connection, this variable is set to the cipher suite that was negotiated, for


@@ -11906,24 +12054,39 @@ received over unencrypted connections, the variable is empty. Testing
 &$tls_cipher$& for emptiness is one way of distinguishing between encrypted and
 non-encrypted connections during ACL processing.
 
 &$tls_cipher$& for emptiness is one way of distinguishing between encrypted and
 non-encrypted connections during ACL processing.
 

-The &$tls_cipher$& variable retains its value during message delivery, except
-when an outward SMTP delivery takes place via the &(smtp)& transport. In this
-case, &$tls_cipher$& is cleared before any outgoing SMTP connection is made,
+The deprecated &$tls_cipher$& variable is the same as &$tls_in_cipher$& during message reception,
+but in the context of an outward SMTP delivery taking place via the &(smtp)& transport
+becomes the same as &$tls_out_cipher$&.
+
+.vitem &$tls_out_cipher$&
+.vindex "&$tls_out_cipher$&"
+This variable is
+cleared before any outgoing SMTP connection is made,

 and then set to the outgoing cipher suite if one is negotiated. See chapter
 &<<CHAPTLS>>& for details of TLS support and chapter &<<CHAPsmtptrans>>& for
 details of the &(smtp)& transport.
 
 and then set to the outgoing cipher suite if one is negotiated. See chapter
 &<<CHAPTLS>>& for details of TLS support and chapter &<<CHAPsmtptrans>>& for
 details of the &(smtp)& transport.
 

-.vitem &$tls_peerdn$&
+.vitem &$tls_in_peerdn$&
+.vindex "&$tls_in_peerdn$&"

 .vindex "&$tls_peerdn$&"
 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
 .vindex "&$tls_peerdn$&"
 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

-&$tls_peerdn$& during subsequent processing. Like &$tls_cipher$&, the
-value is retained during message delivery, except during outbound SMTP
-deliveries.
+&$tls_in_peerdn$& during subsequent processing.

 
 

-.new
-.vitem &$tls_sni$&
+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 outbound.
+
+.vitem &$tls_out_peerdn$&
+.vindex "&$tls_out_peerdn$&"
+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.
+
+.vitem &$tls_in_sni$&
+.vindex "&$tls_in_sni$&"

 .vindex "&$tls_sni$&"
 .cindex "TLS" "Server Name Indication"
 When a TLS session is being established, if the client sends the Server
 .vindex "&$tls_sni$&"
 .cindex "TLS" "Server Name Indication"
 When a TLS session is being established, if the client sends the Server


@@ -11934,10 +12097,16 @@ will be re-expanded early in the TLS session, to permit
 a different certificate to be presented (and optionally a different key to be
 used) to the client, based upon the value of the SNI extension.
 
 a different certificate to be presented (and optionally a different key to be
 used) to the client, based upon the value of the SNI extension.
 

-The value will be retained for the lifetime of the message.  During outbound
-SMTP deliveries, it reflects the value of the &%tls_sni%& option on
+The deprecated &$tls_sni$& variable refers to the inbound side
+except when used in the context of an outbound SMTP delivery, when it refers to
+the outbound.
+
+.vitem &$tls_out_sni$&
+.vindex "&$tls_out_sni$&"
+.cindex "TLS" "Server Name Indication"
+During outbound
+SMTP deliveries, this variable reflects the value of the &%tls_sni%& option on

 the transport.
 the transport.

-.wen

 
 .vitem &$tod_bsdinbox$&
 .vindex "&$tod_bsdinbox$&"
 
 .vitem &$tod_bsdinbox$&
 .vindex "&$tod_bsdinbox$&"


@@ -12688,10 +12857,14 @@ listed in more than one group.
 .section "TLS" "SECID108"
 .table2
 .row &%gnutls_compat_mode%&          "use GnuTLS compatibility mode"
 .section "TLS" "SECID108"
 .table2
 .row &%gnutls_compat_mode%&          "use GnuTLS compatibility mode"

+.new
+.row &%gnutls_enable_pkcs11%&        "allow GnuTLS to autoload PKCS11 modules"
+.wen

 .row &%openssl_options%&             "adjust OpenSSL compatibility options"
 .row &%tls_advertise_hosts%&         "advertise TLS to these hosts"
 .row &%tls_certificate%&             "location of server certificate"
 .row &%tls_crl%&                     "certificate revocation list"
 .row &%openssl_options%&             "adjust OpenSSL compatibility options"
 .row &%tls_advertise_hosts%&         "advertise TLS to these hosts"
 .row &%tls_certificate%&             "location of server certificate"
 .row &%tls_crl%&                     "certificate revocation list"

+.row &%tls_dh_max_bits%&             "clamp D-H bit count suggestion"

 .row &%tls_dhparam%&                 "DH parameters for server"
 .row &%tls_on_connect_ports%&        "specify SSMTP (SMTPS) ports"
 .row &%tls_privatekey%&              "location of server private key"
 .row &%tls_dhparam%&                 "DH parameters for server"
 .row &%tls_on_connect_ports%&        "specify SSMTP (SMTPS) ports"
 .row &%tls_privatekey%&              "location of server private key"


@@ -12836,6 +13009,9 @@ See also the &'Policy controls'& section above.
 .row &%dns_ipv4_lookup%&             "only v4 lookup for these domains"
 .row &%dns_retrans%&                 "parameter for resolver"
 .row &%dns_retry%&                   "parameter for resolver"
 .row &%dns_ipv4_lookup%&             "only v4 lookup for these domains"
 .row &%dns_retrans%&                 "parameter for resolver"
 .row &%dns_retry%&                   "parameter for resolver"

+.new
+.row &%dns_use_dnssec%&              "parameter for resolver"
+.wen

 .row &%dns_use_edns0%&               "parameter for resolver"
 .row &%hold_domains%&                "hold delivery for these domains"
 .row &%local_interfaces%&            "for routing checks"
 .row &%dns_use_edns0%&               "parameter for resolver"
 .row &%hold_domains%&                "hold delivery for these domains"
 .row &%local_interfaces%&            "for routing checks"


@@ -12880,7 +13056,6 @@ See also the &'Policy controls'& section above.
 Those options that undergo string expansion before use are marked with
 &dagger;.
 
 Those options that undergo string expansion before use are marked with
 &dagger;.
 

-.new

 .option accept_8bitmime main boolean true
 .cindex "8BITMIME"
 .cindex "8-bit characters"
 .option accept_8bitmime main boolean true
 .cindex "8BITMIME"
 .cindex "8-bit characters"


@@ -12896,7 +13071,6 @@ A more detailed analysis of the issues is provided by Dan Bernstein:
 .display
 &url(http://cr.yp.to/smtp/8bitmime.html)
 .endd
 .display
 &url(http://cr.yp.to/smtp/8bitmime.html)
 .endd

-.wen

 
 .option acl_not_smtp main string&!! unset
 .cindex "&ACL;" "for non-SMTP messages"
 
 .option acl_not_smtp main string&!! unset
 .cindex "&ACL;" "for non-SMTP messages"


@@ -13077,10 +13251,10 @@ If you want to advertise the availability of AUTH only when the connection
 is encrypted using TLS, you can make use of the fact that the value of this
 option is expanded, with a setting like this:
 .code
 is encrypted using TLS, you can make use of the fact that the value of this
 option is expanded, with a setting like this:
 .code

-auth_advertise_hosts = ${if eq{$tls_cipher}{}{}{*}}
+auth_advertise_hosts = ${if eq{$tls_in_cipher}{}{}{*}}

 .endd
 .endd

-.vindex "&$tls_cipher$&"
-If &$tls_cipher$& is empty, the session is not encrypted, and the result of
+.vindex "&$tls_in_cipher$&"
+If &$tls_in_cipher$& is empty, the session is not encrypted, and the result of

 the expansion is empty, thus matching no hosts. Otherwise, the result of the
 expansion is *, which matches all hosts.
 
 the expansion is empty, thus matching no hosts. Otherwise, the result of the
 expansion is *, which matches all hosts.
 


@@ -13479,6 +13653,17 @@ See &%dns_retrans%& above.
 
 
 .new
 
 
 .new

+.option dns_use_dnssec main integer -1
+.cindex "DNS" "resolver options"
+.cindex "DNS" "DNSSEC"
+If this option is set to a non-negative number then Exim will initialise the
+DNS resolver library to either use or not use DNSSEC, overriding the system
+default. A value of 0 coerces DNSSEC off, a value of 1 coerces DNSSEC on.
+
+If the resolver library does not support DNSSEC then this option has no effect.
+.wen
+
+

 .option dns_use_edns0 main integer -1
 .cindex "DNS" "resolver options"
 .cindex "DNS" "EDNS0"
 .option dns_use_edns0 main integer -1
 .cindex "DNS" "resolver options"
 .cindex "DNS" "EDNS0"


@@ -13488,7 +13673,6 @@ the system default. A value of 0 coerces EDNS0 off, a value of 1 coerces EDNS0
 on.
 
 If the resolver library does not support EDNS0 then this option has no effect.
 on.
 
 If the resolver library does not support EDNS0 then this option has no effect.

-.wen

 
 
 .option drop_cr main boolean false
 
 
 .option drop_cr main boolean false


@@ -13704,6 +13888,19 @@ This option controls whether GnuTLS is used in compatibility mode in an Exim
 server. This reduces security slightly, but improves interworking with older
 implementations of TLS.
 
 server. This reduces security slightly, but improves interworking with older
 implementations of TLS.
 

+
+.new
+option gnutls_enable_pkcs11 main boolean unset
+This option will let GnuTLS (2.12.0 or later) autoload PKCS11 modules with
+the p11-kit configuration files in &_/etc/pkcs11/modules/_&.
+
+See
+&url(http://www.gnu.org/software/gnutls/manual/gnutls.html#Smart-cards-and-HSMs)
+for documentation.
+.wen
+
+
+

 .option headers_charset main string "see below"
 This option sets a default character set for translating from encoded MIME
 &"words"& in header lines, when referenced by an &$h_xxx$& expansion item. The
 .option headers_charset main string "see below"
 This option sets a default character set for translating from encoded MIME
 &"words"& in header lines, when referenced by an &$h_xxx$& expansion item. The


@@ -14382,7 +14579,7 @@ harm. This option overrides the &%pipe_as_creator%& option of the &(pipe)&
 transport driver.
 
 
 transport driver.
 
 

-.option openssl_options main "string list" unset
+.option openssl_options main "string list" "+no_sslv2"

 .cindex "OpenSSL "compatibility options"
 This option allows an administrator to adjust the SSL options applied
 by OpenSSL to connections.  It is given as a space-separated list of items,
 .cindex "OpenSSL "compatibility options"
 This option allows an administrator to adjust the SSL options applied
 by OpenSSL to connections.  It is given as a space-separated list of items,


@@ -14402,12 +14599,10 @@ 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.
 

-.new

 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.

-.wen

 
 An example:
 .code
 
 An example:
 .code


@@ -14797,7 +14992,7 @@ received_header_text = Received: \
   ${if def:sender_helo_name {(helo=$sender_helo_name)\n\t}}}}\
   by $primary_hostname \
   ${if def:received_protocol {with $received_protocol}} \
   ${if def:sender_helo_name {(helo=$sender_helo_name)\n\t}}}}\
   by $primary_hostname \
   ${if def:received_protocol {with $received_protocol}} \

-  ${if def:tls_cipher {($tls_cipher)\n\t}}\
+  ${if def:tls_in_cipher {($tls_in_cipher)\n\t}}\

   (Exim $version_number)\n\t\
   ${if def:sender_address \
   {(envelope-from <$sender_address>)\n\t}}\
   (Exim $version_number)\n\t\
   ${if def:sender_address \
   {(envelope-from <$sender_address>)\n\t}}\


@@ -15041,7 +15236,7 @@ live with.
 . Allow this long option name to split; give it unsplit as a fifth argument
 . for the automatic .oindex that is generated by .option.
 
 . Allow this long option name to split; give it unsplit as a fifth argument
 . for the automatic .oindex that is generated by .option.
 

-.option "smtp_accept_max_per_ &~&~connection" main integer 1000 &&&
+.option "smtp_accept_max_per_connection" main integer 1000 &&&

          smtp_accept_max_per_connection
 .cindex "SMTP" "limiting incoming message count"
 .cindex "limit" "messages per SMTP connection"
          smtp_accept_max_per_connection
 .cindex "SMTP" "limiting incoming message count"
 .cindex "limit" "messages per SMTP connection"


@@ -15660,12 +15855,10 @@ receiving incoming messages as a server. If you want to supply certificates for
 use when sending messages as a client, you must set the &%tls_certificate%&
 option in the relevant &(smtp)& transport.
 
 use when sending messages as a client, you must set the &%tls_certificate%&
 option in the relevant &(smtp)& transport.
 

-.new
-If the option contains &$tls_sni$& and Exim is built against OpenSSL, then
+If the option contains &$tls_out_sni$& and Exim is built against OpenSSL, then

 if the OpenSSL build supports TLS extensions and the TLS client sends the
 Server Name Indication extension, then this option and others documented in
 &<<SECTtlssni>>& will be re-expanded.
 if the OpenSSL build supports TLS extensions and the TLS client sends the
 Server Name Indication extension, then this option and others documented in
 &<<SECTtlssni>>& will be re-expanded.

-.wen

 
 .option tls_crl main string&!! unset
 .cindex "TLS" "server certificate revocation list"
 
 .option tls_crl main string&!! unset
 .cindex "TLS" "server certificate revocation list"


@@ -15673,17 +15866,68 @@ Server Name Indication extension, then this option and others documented in
 This option specifies a certificate revocation list. The expanded value must
 be the name of a file that contains a CRL in PEM format.
 
 This option specifies a certificate revocation list. The expanded value must
 be the name of a file that contains a CRL in PEM format.
 

-.new

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

-.wen
+
+
+.option tls_dh_max_bits main integer 2236
+.cindex "TLS" "D-H bit count"
+The number of bits used for Diffie-Hellman key-exchange may be suggested by
+the chosen TLS library.  That value might prove to be too high for
+interoperability.  This option provides a maximum clamp on the value
+suggested, trading off security for interoperability.
+
+The value must be at least 1024.
+
+The value 2236 was chosen because, at time of adding the option, it was the
+hard-coded maximum value supported by the NSS cryptographic library, as used
+by Thunderbird, while GnuTLS was suggesting 2432 bits as normal.
+
+If you prefer more security and are willing to break some clients, raise this
+number.
+
+Note that the value passed to GnuTLS for *generating* a new prime may be a
+little less than this figure, because GnuTLS is inexact and may produce a
+larger prime than requested.

 
 
 .option tls_dhparam main string&!! unset
 .cindex "TLS" "D-H parameters for server"
 
 
 .option tls_dhparam main string&!! unset
 .cindex "TLS" "D-H parameters for server"

-The value of this option is expanded, and must then be the absolute path to
-a file which contains the server's DH parameter values.
-This is used only for OpenSSL. When Exim is linked with GnuTLS, this option is
-ignored. See section &<<SECTopenvsgnu>>& for further details.
+The value of this option is expanded and indicates the source of DH parameters
+to be used by Exim.
+
+If it is a filename starting with a &`/`&, then it names a file from which DH
+parameters should be loaded.  If the file exists, it should hold a PEM-encoded
+PKCS#3 representation of the DH prime.  If the file does not exist, for
+OpenSSL it is an error.  For GnuTLS, Exim will attempt to create the file and
+fill it with a generated DH prime.  For OpenSSL, if the DH bit-count from
+loading the file is greater than &%tls_dh_max_bits%& then it will be ignored,
+and treated as though the &%tls_dhparam%& were set to "none".
+
+If this option expands to the string "none", then no DH parameters will be
+loaded by Exim.
+
+If this option expands to the string "historic" and Exim is using GnuTLS, then
+Exim will attempt to load a file from inside the spool directory.  If the file
+does not exist, Exim will attempt to create it.
+See section &<<SECTgnutlsparam>>& for further details.
+
+If Exim is using OpenSSL and this option is empty or unset, then Exim will load
+a default DH prime; the default is the 2048 bit prime described in section
+2.2 of RFC 5114, "2048-bit MODP Group with 224-bit Prime Order Subgroup", which
+in IKE is assigned number 23.
+
+Otherwise, the option must expand to the name used by Exim for any of a number
+of DH primes specified in RFC 2409, RFC 3526 and RFC 5114.  As names, Exim uses
+"ike" followed by the number used by IKE, of "default" which corresponds to
+"ike23".
+
+The available primes are:
+&`ike1`&, &`ike2`&, &`ike5`&,
+&`ike14`&, &`ike15`&, &`ike16`&, &`ike17`&, &`ike18`&,
+&`ike22`&, &`ike23`& (aka &`default`&) and &`ike24`&.
+
+Some of these will be too small to be accepted by clients.
+Some may be too large to be accepted by clients.

 
 
 .option tls_on_connect_ports main "string list" unset
 
 
 .option tls_on_connect_ports main "string list" unset


@@ -15702,9 +15946,7 @@ the expansion is forced to fail, or the result is an empty string, the private
 key is assumed to be in the same file as the server's certificates. See chapter
 &<<CHAPTLS>>& for further details.
 
 key is assumed to be in the same file as the server's certificates. See chapter
 &<<CHAPTLS>>& for further details.
 

-.new

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

-.wen

 
 
 .option tls_remember_esmtp main boolean false
 
 
 .option tls_remember_esmtp main boolean false


@@ -15752,9 +15994,7 @@ 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.
 
 Thus the values defined should be considered public data.  To avoid this,
 use OpenSSL with a directory.
 

-.new

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

-.wen

 
 
 .option tls_verify_hosts main "host list&!!" unset
 
 
 .option tls_verify_hosts main "host list&!!" unset


@@ -17076,6 +17316,38 @@ look for A or AAAA records, unless the domain matches &%mx_domains%&, in which
 case routing fails.
 
 
 case routing fails.
 
 

+.section "Declining addresses by dnslookup" "SECTdnslookupdecline"
+.cindex "&(dnslookup)& router" "declines"
+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%&.
+
+Reasons for a &(dnslookup)& router to decline currently include:
+.ilist
+The domain does not exist in DNS
+.next
+The domain exists but the MX record's host part is just "."; this is a common
+convention (borrowed from SRV) used to indicate that there is no such service
+for this domain and to not fall back to trying A/AAAA records.
+.next
+Ditto, but for SRV records, when &%check_srv%& is set on this router.
+.next
+MX record points to a non-existent host.
+.next
+MX record points to an IP address and the main section option
+&%allow_mx_to_ip%& is not set.
+.next
+MX records exist and point to valid hosts, but all hosts resolve only to
+addresses blocked by the &%ignore_target_hosts%& generic option on this router.
+.next
+The domain is not syntactically valid (see also &%allow_utf8_domains%& and
+&%dns_check_names_pattern%& for handling one variant of this)
+.next
+&%check_secondary_mx%& is set on this router but the local host can
+not be found in the MX records (see below)
+.endlist
+
+

 
 
 .section "Private options for dnslookup" "SECID118"
 
 
 .section "Private options for dnslookup" "SECID118"


@@ -18299,6 +18571,18 @@ quote just the command. An item such as
 .endd
 is interpreted as a pipe with a rather strange command name, and no arguments.
 
 .endd
 is interpreted as a pipe with a rather strange command name, and no arguments.
 

+.new
+Note that the above example assumes that the text comes from a lookup source
+of some sort, so that the quotes are part of the data.  If composing a
+redirect router with a &%data%& option directly specifying this command, the
+quotes will be used by the configuration parser to define the extent of one
+string, but will not be passed down into the redirect router itself.  There
+are two main approaches to get around this: escape quotes to be part of the
+data itself, or avoid using this mechanism and instead create a custom
+transport with the &%command%& option set and reference that transport from
+an &%accept%& router.
+.wen
+

 .next
 .cindex "file" "in redirection list"
 .cindex "address redirection" "to file"
 .next
 .cindex "file" "in redirection list"
 .cindex "address redirection" "to file"


@@ -20194,7 +20478,6 @@ This option applies only to deliveries in maildir format, and is described in
 section &<<SECTmaildirdelivery>>& below.
 
 
 section &<<SECTmaildirdelivery>>& below.
 
 

-.new

 .option maildir_use_size_file appendfile&!! boolean false
 .cindex "maildir format" "&_maildirsize_& file"
 The result of string expansion for this option must be a valid boolean value.
 .option maildir_use_size_file appendfile&!! boolean false
 .cindex "maildir format" "&_maildirsize_& file"
 The result of string expansion for this option must be a valid boolean value.


@@ -20203,7 +20486,6 @@ creates a &_maildirsize_& file in a maildir if one does not exist, taking the
 quota from the &%quota%& option of the transport. If &%quota%& is unset, the
 value is zero. See &%maildir_quota_directory_regex%& above and section
 &<<SECTmaildirdelivery>>& below for further details.
 quota from the &%quota%& option of the transport. If &%quota%& is unset, the
 value is zero. See &%maildir_quota_directory_regex%& above and section
 &<<SECTmaildirdelivery>>& below for further details.

-.wen

 
 .option maildirfolder_create_regex appendfile string unset
 .cindex "maildir format" "&_maildirfolder_& file"
 
 .option maildirfolder_create_regex appendfile string unset
 .cindex "maildir format" "&_maildirfolder_& file"


@@ -21852,6 +22134,9 @@ appropriate values for the outgoing connection, and these are the values that
 are in force when any authenticators are run and when the
 &%authenticated_sender%& option is expanded.
 
 are in force when any authenticators are run and when the
 &%authenticated_sender%& option is expanded.
 

+These variables are deprecated in favour of &$tls_in_cipher$& et. al.
+and will be removed in a future release.
+

 
 .section "Private options for smtp" "SECID146"
 .cindex "options" "&(smtp)& transport"
 
 .section "Private options for smtp" "SECID146"
 .cindex "options" "&(smtp)& transport"


@@ -21889,7 +22174,7 @@ ignored.
 
 The expansion happens after the outgoing connection has been made and TLS
 started, if required. This means that the &$host$&, &$host_address$&,
 
 The expansion happens after the outgoing connection has been made and TLS
 started, if required. This means that the &$host$&, &$host_address$&,

-&$tls_cipher$&, and &$tls_peerdn$& variables are set according to the
+&$tls_out_cipher$&, and &$tls_out_peerdn$& variables are set according to the

 particular connection.
 
 If the SMTP session is not authenticated, the expansion of
 particular connection.
 
 If the SMTP session is not authenticated, the expansion of


@@ -21985,6 +22270,22 @@ See the &%search_parents%& option in chapter &<<CHAPdnslookup>>& for more
 details.
 
 
 details.
 
 

+.new
+.option dscp smtp string&!! unset
+.cindex "DCSP" "outbound"
+This option causes the DSCP value associated with a socket to be set to one
+of a number of fixed strings or to numeric value.
+The &%-bI:dscp%& option may be used to ask Exim which names it knows of.
+Common values include &`throughput`&, &`mincost`&, and on newer systems
+&`ef`&, &`af41`&, etc.  Numeric values may be in the range 0 to 0x3F.
+
+The outbound packets from Exim will be marked with this value in the header
+(for IPv4, the TOS field; for IPv6, the TCLASS field); there is no guarantee
+that these values will have any effect, not be stripped by networking
+equipment, or do much of anything without cooperation with your Network
+Engineer and those of all network operators between the source and destination.
+.wen
+

 
 .option fallback_hosts smtp "string list" unset
 .cindex "fallback" "hosts specified on transport"
 
 .option fallback_hosts smtp "string list" unset
 .cindex "fallback" "hosts specified on transport"


@@ -22118,6 +22419,13 @@ 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&!!" *
+.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.
+

 
 .option hosts_max_try smtp integer 5
 .cindex "host" "maximum number to try"
 
 .option hosts_max_try smtp integer 5
 .cindex "host" "maximum number to try"


@@ -22295,12 +22603,10 @@ protocol (RFC 2033) instead of SMTP. This protocol is sometimes used for local
 deliveries into closed message stores. Exim also has support for running LMTP
 over a pipe to a local process &-- see chapter &<<CHAPLMTP>>&.
 
 deliveries into closed message stores. Exim also has support for running LMTP
 over a pipe to a local process &-- see chapter &<<CHAPLMTP>>&.
 

-.new

 If this option is set to &"smtps"&, the default vaule for the &%port%& option
 changes to &"smtps"&, and the transport initiates TLS immediately after
 connecting, as an outbound SSL-on-connect, instead of using STARTTLS to upgrade.
 The Internet standards bodies strongly discourage use of this mode.
 If this option is set to &"smtps"&, the default vaule for the &%port%& option
 changes to &"smtps"&, and the transport initiates TLS immediately after
 connecting, as an outbound SSL-on-connect, instead of using STARTTLS to upgrade.
 The Internet standards bodies strongly discourage use of this mode.

-.wen

 
 
 .option retry_include_ip_address smtp boolean true
 
 
 .option retry_include_ip_address smtp boolean true


@@ -22384,6 +22690,19 @@ This option specifies a certificate revocation list. The expanded value must
 be the name of a file that contains a CRL in PEM format.
 
 
 be the name of a file that contains a CRL in PEM format.
 
 

+.new
+.option tls_dh_min_bits smtp integer 1024
+.cindex "TLS" "Diffie-Hellman minimum acceptable size"
+When establishing a TLS session, if a ciphersuite which uses Diffie-Hellman
+key agreement is negotiated, the server will provide a large prime number
+for use.  This option establishes the minimum acceptable size of that number.
+If the parameter offered by the server is too small, then the TLS handshake
+will fail.
+
+Only supported when using GnuTLS.
+.wen
+
+

 .option tls_privatekey smtp string&!! unset
 .cindex "TLS" "client private key, location of"
 .vindex "&$host$&"
 .option tls_privatekey smtp string&!! unset
 .cindex "TLS" "client private key, location of"
 .vindex "&$host$&"


@@ -22413,19 +22732,19 @@ ciphers is a preference order.
 
 
 
 
 
 

-.new

 .option tls_sni smtp string&!! unset
 .cindex "TLS" "Server Name Indication"
 .vindex "&$tls_sni$&"
 .option tls_sni smtp string&!! unset
 .cindex "TLS" "Server Name Indication"
 .vindex "&$tls_sni$&"

-If this option is set then it sets the $tls_sni variable and causes any
+If this option is set then it sets the $tls_out_sni variable and causes any

 TLS session to pass this value as the Server Name Indication extension to
 the remote side, which can be used by the remote side to select an appropriate
 certificate and private key for the session.
 
 See &<<SECTtlssni>>& for more information.
 
 TLS session to pass this value as the Server Name Indication extension to
 the remote side, which can be used by the remote side to select an appropriate
 certificate and private key for the session.
 
 See &<<SECTtlssni>>& for more information.
 

-OpenSSL only, also requiring a build of OpenSSL that supports TLS extensions.
-.wen
+Note that for OpenSSL, this feature requires a build of OpenSSL that supports
+TLS extensions.
+

 
 
 
 
 
 


@@ -23604,18 +23923,15 @@ included by setting
 .code
 AUTH_CRAM_MD5=yes
 AUTH_CYRUS_SASL=yes
 .code
 AUTH_CRAM_MD5=yes
 AUTH_CYRUS_SASL=yes

-.new

 AUTH_DOVECOT=yes
 AUTH_GSASL=yes
 AUTH_HEIMDAL_GSSAPI=yes
 AUTH_DOVECOT=yes
 AUTH_GSASL=yes
 AUTH_HEIMDAL_GSSAPI=yes

-.wen

 AUTH_PLAINTEXT=yes
 AUTH_SPA=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
 the Cyrus SASL authentication library.
 AUTH_PLAINTEXT=yes
 AUTH_SPA=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
 the Cyrus SASL authentication library.

-.new

 The third is an interface to Dovecot's authentication system, delegating the
 work via a socket interface.
 The fourth provides an interface to the GNU SASL authentication library, which
 The third is an interface to Dovecot's authentication system, delegating the
 work via a socket interface.
 The fourth provides an interface to the GNU SASL authentication library, which


@@ -23626,7 +23942,6 @@ 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.

-.wen

 
 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


@@ -23658,7 +23973,6 @@ The remainder of this chapter covers the generic options for the
 authenticators, followed by general discussion of the way authentication works
 in Exim.
 
 authenticators, followed by general discussion of the way authentication works
 in Exim.
 

-.new

 &*Beware:*& the meaning of &$auth1$&, &$auth2$&, ... varies on a per-driver and
 per-mechanism basis.  Please read carefully to determine which variables hold
 account labels such as usercodes and which hold passwords or other
 &*Beware:*& the meaning of &$auth1$&, &$auth2$&, ... varies on a per-driver and
 per-mechanism basis.  Please read carefully to determine which variables hold
 account labels such as usercodes and which hold passwords or other


@@ -23680,7 +23994,6 @@ A &'realm'& is a text string, typically a domain name, presented by a server
 to a client to help it select an account and credentials to use.  In some
 mechanisms, the client and server provably agree on the realm, but clients
 typically can not treat the realm as secure data to be blindly trusted.
 to a client to help it select an account and credentials to use.  In some
 mechanisms, the client and server provably agree on the realm, but clients
 typically can not treat the realm as secure data to be blindly trusted.

-.wen

 
 
 
 
 
 


@@ -23694,11 +24007,8 @@ When Exim is authenticating as a client, it skips any authenticator whose
 used, for example, to skip plain text authenticators when the connection is not
 encrypted by a setting such as:
 .code
 used, for example, to skip plain text authenticators when the connection is not
 encrypted by a setting such as:
 .code

-client_condition = ${if !eq{$tls_cipher}{}}
+client_condition = ${if !eq{$tls_out_cipher}{}}

 .endd
 .endd

-(Older documentation incorrectly states that &$tls_cipher$& contains the cipher
-used for incoming messages. In fact, during SMTP delivery, it contains the
-cipher used for the delivery.)

 
 
 .option driver authenticators string unset
 
 
 .option driver authenticators string unset


@@ -23728,10 +24038,8 @@ This option must be set for a &%plaintext%& server authenticator, where it
 is used directly to control authentication. See section &<<SECTplainserver>>&
 for details.
 
 is used directly to control authentication. See section &<<SECTplainserver>>&
 for details.
 

-.new

 For the &(gsasl)& authenticator, this option is required for various
 mechanisms; see chapter &<<CHAPgsasl>>& for details.
 For the &(gsasl)& authenticator, this option is required for various
 mechanisms; see chapter &<<CHAPgsasl>>& for details.

-.wen

 
 For the other authenticators, &%server_condition%& can be used as an additional
 authentication or authorization mechanism that is applied after the other
 
 For the other authenticators, &%server_condition%& can be used as an additional
 authentication or authorization mechanism that is applied after the other


@@ -23860,10 +24168,10 @@ authentication mechanisms. For example, it can be used to restrict the
 advertisement of a particular mechanism to encrypted connections, by a setting
 such as:
 .code
 advertisement of a particular mechanism to encrypted connections, by a setting
 such as:
 .code

-server_advertise_condition = ${if eq{$tls_cipher}{}{no}{yes}}
+server_advertise_condition = ${if eq{$tls_in_cipher}{}{no}{yes}}

 .endd
 .endd

-.vindex "&$tls_cipher$&"
-If the session is encrypted, &$tls_cipher$& is not empty, and so the expansion
+.vindex "&$tls_in_cipher$&"
+If the session is encrypted, &$tls_in_cipher$& is not empty, and so the expansion

 yields &"yes"&, which allows the advertisement to happen.
 
 When an Exim server receives an AUTH command from a client, it rejects it
 yields &"yes"&, which allows the advertisement to happen.
 
 When an Exim server receives an AUTH command from a client, it rejects it


@@ -24338,7 +24646,6 @@ lookup_cram:
 Note that this expansion explicitly forces failure if the lookup fails
 because &$auth1$& contains an unknown user name.
 
 Note that this expansion explicitly forces failure if the lookup fails
 because &$auth1$& contains an unknown user name.
 

-.new

 As another example, if you wish to re-use a Cyrus SASL sasldb2 file without
 using the relevant libraries, you need to know the realm to specify in the
 lookup and then ask for the &"userPassword"& attribute for that user in that
 As another example, if you wish to re-use a Cyrus SASL sasldb2 file without
 using the relevant libraries, you need to know the realm to specify in the
 lookup and then ask for the &"userPassword"& attribute for that user in that


@@ -24351,7 +24658,6 @@ cyrusless_crammd5:
                   dbmjz{/etc/sasldb2}}
   server_set_id = $auth1
 .endd
                   dbmjz{/etc/sasldb2}}
   server_set_id = $auth1
 .endd

-.wen

 
 .section "Using cram_md5 as a client" "SECID177"
 .cindex "options" "&(cram_md5)& authenticator (client)"
 
 .section "Using cram_md5 as a client" "SECID177"
 .cindex "options" "&(cram_md5)& authenticator (client)"


@@ -24426,7 +24732,7 @@ Kerberos, note that because of limitations in the GSSAPI interface,
 changing the server keytab might need to be communicated down to the Kerberos
 layer independently. The mechanism for doing so is dependent upon the Kerberos
 implementation.
 changing the server keytab might need to be communicated down to the Kerberos
 layer independently. The mechanism for doing so is dependent upon the Kerberos
 implementation.

-.new
+

 For example, for older releases of Heimdal, the environment variable KRB5_KTNAME
 may be set to point to an alternative keytab file. Exim will pass this
 variable through from its own inherited environment when started as root or the
 For example, for older releases of Heimdal, the environment variable KRB5_KTNAME
 may be set to point to an alternative keytab file. Exim will pass this
 variable through from its own inherited environment when started as root or the


@@ -24435,7 +24741,6 @@ With newer releases of Heimdal, a setuid Exim may cause Heimdal to discard the
 environment variable.  In practice, for those releases, the Cyrus authenticator
 is not a suitable interface for GSSAPI (Kerberos) support.  Instead, consider
 the &(heimdal_gssapi)& authenticator, described in chapter &<<CHAPheimdalgss>>&
 environment variable.  In practice, for those releases, the Cyrus authenticator
 is not a suitable interface for GSSAPI (Kerberos) support.  Instead, consider
 the &(heimdal_gssapi)& authenticator, described in chapter &<<CHAPheimdalgss>>&

-.wen

 
 
 .section "Using cyrus_sasl as a server" "SECID178"
 
 
 .section "Using cyrus_sasl as a server" "SECID178"


@@ -24466,10 +24771,8 @@ sasl:
   server_set_id = $auth1
 .endd
 
   server_set_id = $auth1
 .endd
 

-.new

 .option server_realm cyrus_sasl string&!! unset
 This specifies the SASL realm that the server claims to be in.
 .option server_realm cyrus_sasl string&!! unset
 This specifies the SASL realm that the server claims to be in.

-.wen

 
 
 .option server_service cyrus_sasl string &`smtp`&
 
 
 .option server_service cyrus_sasl string &`smtp`&


@@ -24542,7 +24845,6 @@ who authenticated is placed in &$auth1$&.
 
 . ////////////////////////////////////////////////////////////////////////////
 . ////////////////////////////////////////////////////////////////////////////
 
 . ////////////////////////////////////////////////////////////////////////////
 . ////////////////////////////////////////////////////////////////////////////

-.new

 .chapter "The gsasl authenticator" "CHAPgsasl"
 .scindex IIDgsaslauth1 "&(gsasl)& authenticator"
 .scindex IIDgsaslauth2 "authenticators" "&(gsasl)&"
 .chapter "The gsasl authenticator" "CHAPgsasl"
 .scindex IIDgsaslauth1 "&(gsasl)& authenticator"
 .scindex IIDgsaslauth2 "authenticators" "&(gsasl)&"


@@ -24563,7 +24865,7 @@ made that any particular new authentication mechanism will be supported
 without code changes in Exim.
 
 
 without code changes in Exim.
 
 

-.option server_channelbinding gsasl bool false
+.option server_channelbinding gsasl boolean false

 Some authentication mechanisms are able to use external context at both ends
 of the session to bind the authentication to that context, and fail the
 authentication process if that context differs.  Specifically, some TLS
 Some authentication mechanisms are able to use external context at both ends
 of the session to bind the authentication to that context, and fail the
 authentication process if that context differs.  Specifically, some TLS


@@ -24697,12 +24999,10 @@ gsasl_cyrusless_crammd5:
   server_condition = yes
 .endd
 
   server_condition = yes
 .endd
 

-.wen

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

-.new

 .chapter "The heimdal_gssapi authenticator" "CHAPheimdalgss"
 .scindex IIDheimdalgssauth1 "&(heimdal_gssapi)& authenticator"
 .scindex IIDheimdalgssauth2 "authenticators" "&(heimdal_gssapi)&"
 .chapter "The heimdal_gssapi authenticator" "CHAPheimdalgss"
 .scindex IIDheimdalgssauth1 "&(heimdal_gssapi)& authenticator"
 .scindex IIDheimdalgssauth2 "authenticators" "&(heimdal_gssapi)&"


@@ -24749,7 +25049,6 @@ authentication.  If that was empty, this will also be set to the
 GSS Display Name.
 .endlist
 
 GSS Display Name.
 .endlist
 

-.wen

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


@@ -24935,37 +25234,47 @@ There are some differences in usage when using GnuTLS instead of OpenSSL:
 The &%tls_verify_certificates%& option must contain the name of a file, not the
 name of a directory (for OpenSSL it can be either).
 .next
 The &%tls_verify_certificates%& option must contain the name of a file, not the
 name of a directory (for OpenSSL it can be either).
 .next

-The &%tls_dhparam%& option is ignored, because early versions of GnuTLS had no
-facility for varying its Diffie-Hellman parameters. I understand that this has
-changed, but Exim has not been updated to provide this facility.
+The default value for &%tls_dhparam%& differs for historical reasons.

 .next
 .next

-.vindex "&$tls_peerdn$&"
+.vindex "&$tls_in_peerdn$&"
+.vindex "&$tls_out_peerdn$&"

 Distinguished Name (DN) strings reported by the OpenSSL library use a slash for
 separating fields; GnuTLS uses commas, in accordance with RFC 2253. This
 Distinguished Name (DN) strings reported by the OpenSSL library use a slash for
 separating fields; GnuTLS uses commas, in accordance with RFC 2253. This

-affects the value of the &$tls_peerdn$& variable.
+affects the value of the &$tls_in_peerdn$& and &$tls_out_peerdn$& variables.

 .next
 OpenSSL identifies cipher suites using hyphens as separators, for example:
 .next
 OpenSSL identifies cipher suites using hyphens as separators, for example:

-DES-CBC3-SHA. GnuTLS uses underscores, for example: RSA_ARCFOUR_SHA. What is
-more, OpenSSL complains if underscores are present in a cipher list. To make
-life simpler, Exim changes underscores to hyphens for OpenSSL and hyphens to
-underscores for GnuTLS when processing lists of cipher suites in the
+DES-CBC3-SHA. GnuTLS historically used underscores, for example:
+RSA_ARCFOUR_SHA. What is more, OpenSSL complains if underscores are present
+in a cipher list. To make life simpler, Exim changes underscores to hyphens
+for OpenSSL and passes the string unchanged to GnuTLS (expecting the library
+to handle its own older variants) when processing lists of cipher suites in the

 &%tls_require_ciphers%& options (the global option and the &(smtp)& transport
 option).
 .next
 The &%tls_require_ciphers%& options operate differently, as described in the
 sections &<<SECTreqciphssl>>& and &<<SECTreqciphgnu>>&.
 &%tls_require_ciphers%& options (the global option and the &(smtp)& transport
 option).
 .next
 The &%tls_require_ciphers%& options operate differently, as described in the
 sections &<<SECTreqciphssl>>& and &<<SECTreqciphgnu>>&.

+.next

 .new
 .new

+The &%tls_dh_min_bits%& SMTP transport option is only honoured by GnuTLS.
+When using OpenSSL, this option is ignored.
+(If an API is found to let OpenSSL be configured in this way,
+let the Exim Maintainers know and we'll likely use it).
+.wen

 .next
 Some other recently added features may only be available in one or the other.
 This should be documented with the feature.  If the documentation does not
 explicitly state that the feature is infeasible in the other TLS
 implementation, then patches are welcome.
 .next
 Some other recently added features may only be available in one or the other.
 This should be documented with the feature.  If the documentation does not
 explicitly state that the feature is infeasible in the other TLS
 implementation, then patches are welcome.

-.wen

 .endlist
 
 
 .endlist
 
 

-.section "GnuTLS parameter computation" "SECID181"
-.new
+.section "GnuTLS parameter computation" "SECTgnutlsparam"
+This section only applies if &%tls_dhparam%& is set to &`historic`& or to
+an explicit path; if the latter, then the text about generation still applies,
+but not the chosen filename.
+By default, as of Exim 4.80 a hard-coded D-H prime is used.
+See the documentation of &%tls_dhparam%& for more information.
+

 GnuTLS uses D-H parameters that may take a substantial amount of time
 to compute. It is unreasonable to re-compute them for every TLS session.
 Therefore, Exim keeps this data in a file in its spool directory, called
 GnuTLS uses D-H parameters that may take a substantial amount of time
 to compute. It is unreasonable to re-compute them for every TLS session.
 Therefore, Exim keeps this data in a file in its spool directory, called


@@ -24981,6 +25290,10 @@ place, new Exim processes immediately start using it.
 
 For maximum security, the parameters that are stored in this file should be
 recalculated periodically, the frequency depending on your paranoia level.
 
 For maximum security, the parameters that are stored in this file should be
 recalculated periodically, the frequency depending on your paranoia level.

+If you are avoiding using the fixed D-H primes published in RFCs, then you
+are concerned about some advanced attacks and will wish to do this; if you do
+not regenerate then you might as well stick to the standard primes.
+

 Arranging this is easy in principle; just delete the file when you want new
 values to be computed. However, there may be a problem. The calculation of new
 parameters needs random numbers, and these are obtained from &_/dev/random_&.
 Arranging this is easy in principle; just delete the file when you want new
 values to be computed. However, there may be a problem. The calculation of new
 parameters needs random numbers, and these are obtained from &_/dev/random_&.


@@ -24998,14 +25311,18 @@ and letting Exim re-create it, you can generate new parameters using
 renaming. The relevant commands are something like this:
 .code
 # ls
 renaming. The relevant commands are something like this:
 .code
 # ls

-[ look for file; assume gnutls-params-1024 is the most recent ]
+[ look for file; assume gnutls-params-2236 is the most recent ]

 # rm -f new-params
 # touch new-params
 # chown exim:exim new-params
 # chmod 0600 new-params
 # rm -f new-params
 # touch new-params
 # chown exim:exim new-params
 # chmod 0600 new-params

-# certtool --generate-dh-params --bits 1024 >>new-params
+# certtool --generate-dh-params --bits 2236 >>new-params
+# openssl dhparam -noout -text -in new-params | head
+[ check the first line, make sure it's not more than 2236;
+  if it is, then go back to the start ("rm") and repeat
+  until the size generated is at most the size requested ]

 # chmod 0400 new-params
 # chmod 0400 new-params

-# mv new-params gnutls-params-1024
+# mv new-params gnutls-params-2236

 .endd
 If Exim never has to generate the parameters itself, the possibility of
 stalling is removed.
 .endd
 If Exim never has to generate the parameters itself, the possibility of
 stalling is removed.


@@ -25014,11 +25331,24 @@ The filename changed in Exim 4.80, to gain the -bits suffix.  The value which
 Exim will choose depends upon the version of GnuTLS in use.  For older GnuTLS,
 the value remains hard-coded in Exim as 1024.  As of GnuTLS 2.12.x, there is
 a way for Exim to ask for the "normal" number of bits for D-H public-key usage,
 Exim will choose depends upon the version of GnuTLS in use.  For older GnuTLS,
 the value remains hard-coded in Exim as 1024.  As of GnuTLS 2.12.x, there is
 a way for Exim to ask for the "normal" number of bits for D-H public-key usage,

-and Exim does so.  Exim thus removes itself from the policy decision, and the
-filename and bits used change as the GnuTLS maintainers change the value for
-their parameter &`GNUTLS_SEC_PARAM_NORMAL`&.  At the time of writing, this
-gives 2432 bits.
-.wen
+and Exim does so.  This attempt to remove Exim from TLS policy decisions
+failed, as GnuTLS 2.12 returns a value higher than the current hard-coded limit
+of the NSS library.  Thus Exim gains the &%tls_dh_max_bits%& global option,
+which applies to all D-H usage, client or server.  If the value returned by
+GnuTLS is greater than &%tls_dh_max_bits%& then the value will be clamped down
+to &%tls_dh_max_bits%&.  The default value has been set at the current NSS
+limit, which is still much higher than Exim historically used.
+
+The filename and bits used will change as the GnuTLS maintainers change the
+value for their parameter &`GNUTLS_SEC_PARAM_NORMAL`&, as clamped by
+&%tls_dh_max_bits%&.  At the time of writing (mid 2012), GnuTLS 2.12 recommends
+2432 bits, while NSS is limited to 2236 bits.
+
+In fact, the requested value will be *lower* than &%tls_dh_max_bits%&, to
+increase the chance of the generated prime actually being within acceptable
+bounds, as GnuTLS has been observed to overshoot.  Note the check step in the
+procedure above.  There is no sane procedure available to Exim to double-check
+the size of the generated prime, so it might still be too large.

 
 
 .section "Requiring specific ciphers in OpenSSL" "SECTreqciphssl"
 
 
 .section "Requiring specific ciphers in OpenSSL" "SECTreqciphssl"


@@ -25028,7 +25358,10 @@ There is a function in the OpenSSL library that can be passed a list of cipher
 suites before the cipher negotiation takes place. This specifies which ciphers
 are acceptable. The list is colon separated and may contain names like
 DES-CBC3-SHA. Exim passes the expanded value of &%tls_require_ciphers%&
 suites before the cipher negotiation takes place. This specifies which ciphers
 are acceptable. The list is colon separated and may contain names like
 DES-CBC3-SHA. Exim passes the expanded value of &%tls_require_ciphers%&

-directly to this function call. The following quotation from the OpenSSL
+directly to this function call.
+Many systems will install the OpenSSL manual-pages, so you may have
+&'ciphers(1)'& available to you.
+The following quotation from the OpenSSL

 documentation specifies what forms of item are allowed in the cipher string:
 
 .ilist
 documentation specifies what forms of item are allowed in the cipher string:
 
 .ilist


@@ -25065,9 +25398,26 @@ includes any ciphers already present they will be ignored: that is, they will
 not be moved to the end of the list.
 .endlist
 
 not be moved to the end of the list.
 .endlist
 

+The OpenSSL &'ciphers(1)'& command may be used to test the results of a given
+string:
+.code
+# note single-quotes to get ! past any shell history expansion
+$ openssl ciphers 'HIGH:!MD5:!SHA1'
+.endd
+
+This example will let the library defaults be permitted on the MX port, where
+there's probably no identity verification anyway, but ups the ante on the
+submission ports where the administrator might have some influence on the
+choice of clients used:
+.code
+# OpenSSL variant; see man ciphers(1)
+tls_require_ciphers = ${if =={$received_port}{25}\
+                           {DEFAULT}\
+                           {HIGH:!MD5:!SHA1}}
+.endd
+

 
 
 
 

-.new

 .section "Requiring specific ciphers or other parameters in GnuTLS" &&&
          "SECTreqciphgnu"
 .cindex "GnuTLS" "specifying parameters for"
 .section "Requiring specific ciphers or other parameters in GnuTLS" &&&
          "SECTreqciphgnu"
 .cindex "GnuTLS" "specifying parameters for"


@@ -25092,12 +25442,27 @@ aware of future feature enhancements of GnuTLS.
 
 Documentation of the strings accepted may be found in the GnuTLS manual, under
 "Priority strings".  This is online as
 
 Documentation of the strings accepted may be found in the GnuTLS manual, under
 "Priority strings".  This is online as

-&url(http://www.gnu.org/software/gnutls/manual/html_node/Priority-Strings.html).
+&url(http://www.gnu.org/software/gnutls/manual/html_node/Priority-Strings.html),
+but beware that this relates to GnuTLS 3, which may be newer than the version
+installed on your system.  If you are using GnuTLS 3,
+&url(http://www.gnu.org/software/gnutls/manual/html_node/Listing-the-ciphersuites-in-a-priority-string.html, then the example code)
+on that site can be used to test a given string.

 
 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.

-.wen
+
+This example will let the library defaults be permitted on the MX port, where
+there's probably no identity verification anyway, and lowers security further
+by increasing compatibility; but this ups the ante on the submission ports
+where the administrator might have some influence on the choice of clients
+used:
+.code
+# GnuTLS variant
+tls_require_ciphers = ${if =={$received_port}{25}\
+                           {NORMAL:%COMPAT}\
+                           {SECURE128}}
+.endd

 
 
 .section "Configuring an Exim server to use TLS" "SECID182"
 
 
 .section "Configuring an Exim server to use TLS" "SECID182"


@@ -25157,13 +25522,22 @@ this). There is one other option that may be needed in other situations. If
 tls_dhparam = /some/file/name
 .endd
 is set, the SSL library is initialized for the use of Diffie-Hellman ciphers
 tls_dhparam = /some/file/name
 .endd
 is set, the SSL library is initialized for the use of Diffie-Hellman ciphers

-with the parameters contained in the file. This increases the set of cipher
-suites that the server supports. See the command
+with the parameters contained in the file.
+Set this to &`none`& to disable use of DH entirely, by making no prime
+available:
+.code
+tls_dhparam = none
+.endd
+This may also be set to a string identifying a standard prime to be used for
+DH; if it is set to &`default`& or, for OpenSSL, is unset, then the prime
+used is &`ike23`&.  There are a few standard primes available, see the
+documetnation for &%tls_dhparam%& for the complete list.
+
+See the command

 .code
 openssl dhparam
 .endd
 .code
 openssl dhparam
 .endd

-for a way of generating this data. At present, &%tls_dhparam%& is used only
-when Exim is linked with OpenSSL. It is ignored if GnuTLS is being used.
+for a way of generating file data.

 
 The strings supplied for these three options are expanded every time a client
 host connects. It is therefore possible to use different certificates and keys
 
 The strings supplied for these three options are expanded every time a client
 host connects. It is therefore possible to use different certificates and keys


@@ -25173,15 +25547,13 @@ forced to fail, Exim behaves as if the option is not set.
 
 .cindex "cipher" "logging"
 .cindex "log" "TLS cipher"
 
 .cindex "cipher" "logging"
 .cindex "log" "TLS cipher"

-.vindex "&$tls_cipher$&"
-The variable &$tls_cipher$& is set to the cipher suite that was negotiated for
+.vindex "&$tls_in_cipher$&"
+The variable &$tls_in_cipher$& is set to the cipher suite that was negotiated for

 an incoming TLS connection. It is included in the &'Received:'& header of an
 incoming message (by default &-- you can, of course, change this), and it is
 also included in the log line that records a message's arrival, keyed by
 &"X="&, unless the &%tls_cipher%& log selector is turned off. The &%encrypted%&
 condition can be used to test for specific cipher suites in ACLs.
 an incoming TLS connection. It is included in the &'Received:'& header of an
 incoming message (by default &-- you can, of course, change this), and it is
 also included in the log line that records a message's arrival, keyed by
 &"X="&, unless the &%tls_cipher%& log selector is turned off. The &%encrypted%&
 condition can be used to test for specific cipher suites in ACLs.

-(For outgoing SMTP deliveries, &$tls_cipher$& is reset &-- see section
-&<<SECID185>>&.)

 
 Once TLS has been established, the ACLs that run for subsequent SMTP commands
 can check the name of the cipher suite and vary their actions accordingly. The
 
 Once TLS has been established, the ACLs that run for subsequent SMTP commands
 can check the name of the cipher suite and vary their actions accordingly. The


@@ -25190,6 +25562,9 @@ example, OpenSSL uses the name DES-CBC3-SHA for the cipher suite which in other
 contexts is known as TLS_RSA_WITH_3DES_EDE_CBC_SHA. Check the OpenSSL or GnuTLS
 documentation for more details.
 
 contexts is known as TLS_RSA_WITH_3DES_EDE_CBC_SHA. Check the OpenSSL or GnuTLS
 documentation for more details.
 

+For outgoing SMTP deliveries, &$tls_out_cipher$& is used and logged
+(again depending on the &%tls_cipher%& log selector).
+

 
 .section "Requesting and verifying client certificates" "SECID183"
 .cindex "certificate" "verification of client"
 
 .section "Requesting and verifying client certificates" "SECID183"
 .cindex "certificate" "verification of client"


@@ -25226,17 +25601,17 @@ fact that no certificate was verified, and vary their actions accordingly. For
 example, you can insist on a certificate before accepting a message for
 relaying, but not when the message is destined for local delivery.
 
 example, you can insist on a certificate before accepting a message for
 relaying, but not when the message is destined for local delivery.
 

-.vindex "&$tls_peerdn$&"
+.vindex "&$tls_in_peerdn$&"

 When a client supplies a certificate (whether it verifies or not), the value of
 the Distinguished Name of the certificate is made available in the variable
 When a client supplies a certificate (whether it verifies or not), the value of
 the Distinguished Name of the certificate is made available in the variable

-&$tls_peerdn$& during subsequent processing of the message.
+&$tls_in_peerdn$& during subsequent processing of the message.

 
 .cindex "log" "distinguished name"
 Because it is often a long text string, it is not included in the log line or
 &'Received:'& header by default. You can arrange for it to be logged, keyed by
 &"DN="&, by setting the &%tls_peerdn%& log selector, and you can use
 &%received_header_text%& to change the &'Received:'& header. When no
 
 .cindex "log" "distinguished name"
 Because it is often a long text string, it is not included in the log line or
 &'Received:'& header by default. You can arrange for it to be logged, keyed by
 &"DN="&, by setting the &%tls_peerdn%& log selector, and you can use
 &%received_header_text%& to change the &'Received:'& header. When no

-certificate is supplied, &$tls_peerdn$& is empty.
+certificate is supplied, &$tls_in_peerdn$& is empty.

 
 
 .section "Revoked certificates" "SECID184"
 
 
 .section "Revoked certificates" "SECID184"


@@ -25317,12 +25692,12 @@ All the TLS options in the &(smtp)& transport are expanded before use, with
 which the client is connected. Forced failure of an expansion causes Exim to
 behave as if the relevant option were unset.
 
 which the client is connected. Forced failure of an expansion causes Exim to
 behave as if the relevant option were unset.
 

-.vindex &$tls_bits$&
-.vindex &$tls_cipher$&
-.vindex &$tls_peerdn$&
-.vindex &$tls_sni$&
+.vindex &$tls_out_bits$&
+.vindex &$tls_out_cipher$&
+.vindex &$tls_out_peerdn$&
+.vindex &$tls_out_sni$&

 Before an SMTP connection is established, the
 Before an SMTP connection is established, the

-&$tls_bits$&, &$tls_cipher$&, &$tls_peerdn$& and &$tls_sni$&
+&$tls_out_bits$&, &$tls_out_cipher$&, &$tls_out_peerdn$& and &$tls_out_sni$&

 variables are emptied. (Until the first connection, they contain the values
 that were set when the message was received.) If STARTTLS is subsequently
 successfully obeyed, these variables are set to the relevant values for the
 variables are emptied. (Until the first connection, they contain the values
 that were set when the message was received.) If STARTTLS is subsequently
 successfully obeyed, these variables are set to the relevant values for the


@@ -25330,11 +25705,10 @@ outgoing connection.
 
 
 
 
 
 

-.new

 .section "Use of TLS Server Name Indication" "SECTtlssni"
 .cindex "TLS" "Server Name Indication"
 .section "Use of TLS Server Name Indication" "SECTtlssni"
 .cindex "TLS" "Server Name Indication"

-.vindex "&$tls_sni$&"
-.oindex "&%tls_sni%&"
+.vindex "&$tls_in_sni$&"
+.oindex "&%tls_in_sni%&"

 With TLS1.0 or above, there is an extension mechanism by which extra
 information can be included at various points in the protocol.  One of these
 extensions, documented in RFC 6066 (and before that RFC 4366) is
 With TLS1.0 or above, there is an extension mechanism by which extra
 information can be included at various points in the protocol.  One of these
 extensions, documented in RFC 6066 (and before that RFC 4366) is


@@ -25361,14 +25735,14 @@ different clients.  Or even negotiate different cipher suites.
 The &%tls_sni%& option on an SMTP transport is an expanded string; the result,
 if not empty, will be sent on a TLS session as part of the handshake.  There's
 nothing more to it.  Choosing a sensible value not derived insecurely is the
 The &%tls_sni%& option on an SMTP transport is an expanded string; the result,
 if not empty, will be sent on a TLS session as part of the handshake.  There's
 nothing more to it.  Choosing a sensible value not derived insecurely is the

-only point of caution.  The &$tls_sni$& variable will be set to this string
+only point of caution.  The &$tls_out_sni$& variable will be set to this string

 for the lifetime of the client connection (including during authentication).
 
 for the lifetime of the client connection (including during authentication).
 

-Except during SMTP client sessions, if &$tls_sni$& is set then it is a string
+Except during SMTP client sessions, if &$tls_in_sni$& is set then it is a string

 received from a client.
 It can be logged with the &%log_selector%& item &`+tls_sni`&.
 
 received from a client.
 It can be logged with the &%log_selector%& item &`+tls_sni`&.
 

-If the string &`tls_sni`& appears in the main section's &%tls_certificate%&
+If the string &`tls_in_sni`& appears in the main section's &%tls_certificate%&

 option (prior to expansion) then the following options will be re-expanded
 during TLS session handshake, to permit alternative values to be chosen:
 
 option (prior to expansion) then the following options will be re-expanded
 during TLS session handshake, to permit alternative values to be chosen:
 


@@ -25402,7 +25776,6 @@ see &`-servername`& in the output, then OpenSSL has support.
 When Exim is built against GnuTLS, SNI support is available as of GnuTLS
 0.5.10.  (Its presence predates the current API which Exim uses, so if Exim
 built, then you have SNI support).
 When Exim is built against GnuTLS, SNI support is available as of GnuTLS
 0.5.10.  (Its presence predates the current API which Exim uses, so if Exim
 built, then you have SNI support).

-.wen

 
 
 
 
 
 


@@ -26383,7 +26756,7 @@ confusing to some people, so the use of &%endpass%& is no longer recommended as
 This modifier sets up a message that is used as part of the log message if the
 ACL denies access or a &%warn%& statement's conditions are true. For example:
 .code
 This modifier sets up a message that is used as part of the log message if the
 ACL denies access or a &%warn%& statement's conditions are true. For example:
 .code

-require log_message = wrong cipher suite $tls_cipher
+require log_message = wrong cipher suite $tls_in_cipher

         encrypted   = DES-CBC3-SHA
 .endd
 &%log_message%& is also used when recipients are discarded by &%discard%&. For
         encrypted   = DES-CBC3-SHA
 .endd
 &%log_message%& is also used when recipients are discarded by &%discard%&. For


@@ -26600,6 +26973,46 @@ Notice that we put back the lower cased version afterwards, assuming that
 is what is wanted for subsequent tests.
 
 
 is what is wanted for subsequent tests.
 
 

+.new
+.vitem &*control&~=&~cutthrough_delivery*&
+.cindex "&ACL;" "cutthrough routing"
+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.
+
+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.
+
+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.
+.wen
+
+
+.new
+.vitem &*control&~=&~dscp/*&<&'value'&>
+.cindex "&ACL;" "setting DSCP value"
+.cindex "DSCP" "inbound"
+This option causes the DSCP value associated with the socket for the inbound
+connection to be adjusted to a given value, given as one of a number of fixed
+strings or to numeric value.
+The &%-bI:dscp%& option may be used to ask Exim which names it knows of.
+Common values include &`throughput`&, &`mincost`&, and on newer systems
+&`ef`&, &`af41`&, etc.  Numeric values may be in the range 0 to 0x3F.
+
+The outbound packets from Exim will be marked with this value in the header
+(for IPv4, the TOS field; for IPv6, the TCLASS field); there is no guarantee
+that these values will have any effect, not be stripped by networking
+equipment, or do much of anything without cooperation with your Network
+Engineer and those of all network operators between the source and destination.
+.wen
+
+

 .vitem &*control&~=&~debug/*&<&'options'&>
 .cindex "&ACL;" "enabling debug logging"
 .cindex "debugging" "enabling from an ACL"
 .vitem &*control&~=&~debug/*&<&'options'&>
 .cindex "&ACL;" "enabling debug logging"
 .cindex "debugging" "enabling from an ACL"


@@ -26920,6 +27333,7 @@ The conditions are as follows:
 .vitem &*acl&~=&~*&<&'name&~of&~acl&~or&~ACL&~string&~or&~file&~name&~'&>
 .cindex "&ACL;" "nested"
 .cindex "&ACL;" "indirect"
 .vitem &*acl&~=&~*&<&'name&~of&~acl&~or&~ACL&~string&~or&~file&~name&~'&>
 .cindex "&ACL;" "nested"
 .cindex "&ACL;" "indirect"

+.cindex "&ACL;" "arguments"

 .cindex "&%acl%& ACL condition"
 The possible values of the argument are the same as for the
 &%acl_smtp_%&&'xxx'& options. The named or inline ACL is run. If it returns
 .cindex "&%acl%& ACL condition"
 The possible values of the argument are the same as for the
 &%acl_smtp_%&&'xxx'& options. The named or inline ACL is run. If it returns


@@ -26929,6 +27343,10 @@ condition is on a &%warn%& verb. In that case, a &"defer"& return makes the
 condition false. This means that further processing of the &%warn%& verb
 ceases, but processing of the ACL continues.
 
 condition false. This means that further processing of the &%warn%& verb
 ceases, but processing of the ACL continues.
 

+If the argument is a named ACL, up to nine space-separated optional values
+can be appended; they appear in $acl_arg1 to $acl_arg9, and $acl_narg is set
+to the count of values.  The name and values are expanded separately.
+

 If the nested &%acl%& returns &"drop"& and the outer condition denies access,
 the connection is dropped. If it returns &"discard"&, the verb must be
 &%accept%& or &%discard%&, and the action is taken immediately &-- no further
 If the nested &%acl%& returns &"drop"& and the outer condition denies access,
 the connection is dropped. If it returns &"discard"&, the verb must be
 &%accept%& or &%discard%&, and the action is taken immediately &-- no further


@@ -28687,16 +29105,16 @@ Suppose your LAN is 192.168.45.0/24.
 
 In the main part of the configuration, you put the following definitions:
 .code
 
 In the main part of the configuration, you put the following definitions:
 .code

-domainlist local_domains = my.dom1.example : my.dom2.example
-domainlist relay_domains = friend1.example : friend2.example
-hostlist   relay_hosts   = 192.168.45.0/24
+domainlist local_domains    = my.dom1.example : my.dom2.example
+domainlist relay_to_domains = friend1.example : friend2.example
+hostlist   relay_from_hosts = 192.168.45.0/24

 .endd
 Now you can use these definitions in the ACL that is run for every RCPT
 command:
 .code
 acl_check_rcpt:
 .endd
 Now you can use these definitions in the ACL that is run for every RCPT
 command:
 .code
 acl_check_rcpt:

-  accept domains = +local_domains : +relay_domains
-  accept hosts   = +relay_hosts
+  accept domains = +local_domains : +relay_to_domains
+  accept hosts   = +relay_from_hosts

 .endd
 The first statement accepts any RCPT command that contains an address in
 the local or relay domains. For any other domain, control passes to the second
 .endd
 The first statement accepts any RCPT command that contains an address in
 the local or relay domains. For any other domain, control passes to the second


@@ -31308,6 +31726,8 @@ required for the transaction.
 If the remote server advertises support for the STARTTLS command, and Exim
 was built to support TLS encryption, it tries to start a TLS session unless the
 server matches &%hosts_avoid_tls%&. See chapter &<<CHAPTLS>>& for more details.
 If the remote server advertises support for the STARTTLS command, and Exim
 was built to support TLS encryption, it tries to start a TLS session unless the
 server matches &%hosts_avoid_tls%&. See chapter &<<CHAPTLS>>& for more details.

+Either a match in that or &%hosts_verify_avoid_tls%& apply when the transport
+is called for verification.

 
 If the remote server advertises support for the AUTH command, Exim scans
 the authenticators configuration for any suitable client settings, as described
 
 If the remote server advertises support for the AUTH command, Exim scans
 the authenticators configuration for any suitable client settings, as described