Bugzilla #1006: Keep EHLO attributes in case STARTTLS errors are ignored

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

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 7add7e6041da3f201a088eccedd8516323a71040..1ec4181016236d5e7b7ce5a88bac7e3814cda9bd 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -1,4 +1,4 @@
-. $Cambridge: exim/doc/doc-docbook/spec.xfpt,v 1.54 2009/10/13 08:46:06 tom Exp $
+. $Cambridge: exim/doc/doc-docbook/spec.xfpt,v 1.88 2010/06/14 18:51:09 pdp Exp $

 .
 . /////////////////////////////////////////////////////////////////////////////
 . This is the primary source of the Exim Manual. It is an xfpt document that is
 .
 . /////////////////////////////////////////////////////////////////////////////
 . This is the primary source of the Exim Manual. It is an xfpt document that is


@@ -47,8 +47,8 @@
 . the <bookinfo> element must also be updated for each new edition.
 . /////////////////////////////////////////////////////////////////////////////
 
 . the <bookinfo> element must also be updated for each new edition.
 . /////////////////////////////////////////////////////////////////////////////
 

-.set previousversion "4.69"
-.set version "4.70"
+.set previousversion "4.71"
+.set version "4.72"

 
 .set ACL "access control lists (ACLs)"
 .set I   "&nbsp;&nbsp;&nbsp;&nbsp;"
 
 .set ACL "access control lists (ACLs)"
 .set I   "&nbsp;&nbsp;&nbsp;&nbsp;"


@@ -172,15 +172,13 @@
 <bookinfo>
 <title>Specification of the Exim Mail Transfer Agent</title>
 <titleabbrev>The Exim MTA</titleabbrev>
 <bookinfo>
 <title>Specification of the Exim Mail Transfer Agent</title>
 <titleabbrev>The Exim MTA</titleabbrev>

-<date>09 June 2009</date>
-<author><firstname>Philip</firstname><surname>Hazel</surname></author>
-<authorinitials>PH</authorinitials>
-<affiliation><orgname>University of Cambridge Computing Service</orgname></affiliation>
-<address>New Museums Site, Pembroke Street, Cambridge CB2 3QH, England</address>
+<date>29 May 2010</date>
+<author><firstname>Exim</firstname><surname>Maintainers</surname></author>
+<authorinitials>EM</authorinitials>

 <revhistory><revision>
 <revhistory><revision>

-  <revnumber>4.70</revnumber>
-  <date>10 June 2009</date>
-  <authorinitials>PH</authorinitials>
+  <revnumber>4.72</revnumber>
+  <date>29 May 2010</date>
+  <authorinitials>EM</authorinitials>

 </revision></revhistory>
 <copyright><year>2009</year><holder>University of Cambridge</holder></copyright>
 </bookinfo>
 </revision></revhistory>
 <copyright><year>2009</year><holder>University of Cambridge</holder></copyright>
 </bookinfo>


@@ -1898,6 +1896,8 @@ given in chapter &<<CHAPTLS>>&.
 .section "Use of tcpwrappers" "SECID27"
 .cindex "tcpwrappers, building Exim to support"
 .cindex "USE_TCP_WRAPPERS"
 .section "Use of tcpwrappers" "SECID27"
 .cindex "tcpwrappers, building Exim to support"
 .cindex "USE_TCP_WRAPPERS"

+.cindex "TCP_WRAPPERS_DAEMON_NAME"
+.cindex "tcp_wrappers_daemon_name"

 Exim can be linked with the &'tcpwrappers'& library in order to check incoming
 SMTP calls using the &'tcpwrappers'& control files. This may be a convenient
 alternative to Exim's own checking facilities for installations that are
 Exim can be linked with the &'tcpwrappers'& library in order to check incoming
 SMTP calls using the &'tcpwrappers'& control files. This may be a convenient
 alternative to Exim's own checking facilities for installations that are


@@ -1912,14 +1912,17 @@ USE_TCP_WRAPPERS=yes
 CFLAGS=-O -I/usr/local/include
 EXTRALIBS_EXIM=-L/usr/local/lib -lwrap
 .endd
 CFLAGS=-O -I/usr/local/include
 EXTRALIBS_EXIM=-L/usr/local/lib -lwrap
 .endd

-in &_Local/Makefile_&. The name to use in the &'tcpwrappers'& control files is
-&"exim"&. For example, the line
+in &_Local/Makefile_&. The daemon name to use in the &'tcpwrappers'& control
+files is &"exim"&. For example, the line

 .code
 exim : LOCAL  192.168.1.  .friendly.domain.example
 .endd
 in your &_/etc/hosts.allow_& file allows connections from the local host, from
 the subnet 192.168.1.0/24, and from all hosts in &'friendly.domain.example'&.
 .code
 exim : LOCAL  192.168.1.  .friendly.domain.example
 .endd
 in your &_/etc/hosts.allow_& file allows connections from the local host, from
 the subnet 192.168.1.0/24, and from all hosts in &'friendly.domain.example'&.

-All other connections are denied. Consult the &'tcpwrappers'& documentation for
+All other connections are denied. The daemon name used by &'tcpwrappers'&
+can be changed at build time by setting TCP_WRAPPERS_DAEMON_NAME in
+in &_Local/Makefile_&, or by setting tcp_wrappers_daemon_name in the
+configure file. Consult the &'tcpwrappers'& documentation for

 further details.
 
 
 further details.
 
 


@@ -2606,6 +2609,11 @@ This option causes Exim to output a few sentences stating what it is.
 The same output is generated if the Exim binary is called with no options and
 no arguments.
 
 The same output is generated if the Exim binary is called with no options and
 no arguments.
 

+.vitem &%--version%&
+.oindex "&%--version%&"
+This option is an alias for &%-bV%& and causes version information to be
+displayed.
+

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


@@ -2975,6 +2983,7 @@ local part) and outputs what it finds.
 
 .cindex "options" "router &-- extracting"
 .cindex "options" "transport &-- extracting"
 
 .cindex "options" "router &-- extracting"
 .cindex "options" "transport &-- extracting"

+.cindex "options" "authenticator &-- extracting"

 If one of the words &%router%&, &%transport%&, or &%authenticator%& is given,
 followed by the name of an appropriate driver instance, the option settings for
 that driver are output. For example:
 If one of the words &%router%&, &%transport%&, or &%authenticator%& is given,
 followed by the name of an appropriate driver instance, the option settings for
 that driver are output. For example:


@@ -2988,6 +2997,11 @@ using one of the words &%router_list%&, &%transport_list%&, or
 settings can be obtained by using &%routers%&, &%transports%&, or
 &%authenticators%&.
 
 settings can be obtained by using &%routers%&, &%transports%&, or
 &%authenticators%&.
 

+.cindex "options" "macro &-- extracting"
+If invoked by an admin user, then &%macro%&, &%macro_list%& and &%macros%&
+are available, similarly to the drivers.  Because macros are sometimes used
+for storing passwords, this option is restricted.
+The output format is one item per line.

 
 .vitem &%-bp%&
 .oindex "&%-bp%&"
 
 .vitem &%-bp%&
 .oindex "&%-bp%&"


@@ -3165,6 +3179,26 @@ 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"


@@ -3741,7 +3775,7 @@ written to the standard output. This option can be used only by an admin user.
 .vitem &%-Mvc%&&~<&'message&~id'&>
 .oindex "&%-Mvc%&"
 .cindex "message" "listing in RFC 2822 format"
 .vitem &%-Mvc%&&~<&'message&~id'&>
 .oindex "&%-Mvc%&"
 .cindex "message" "listing in RFC 2822 format"

-.cindex "listing" "message in RFC 2922 format"
+.cindex "listing" "message in RFC 2822 format"

 This option causes a copy of the complete message (header lines plus body) to
 be written to the standard output in RFC 2822 format. This option can be used
 only by an admin user.
 This option causes a copy of the complete message (header lines plus body) to
 be written to the standard output in RFC 2822 format. This option can be used
 only by an admin user.


@@ -5885,6 +5919,10 @@ 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>>&.
 
 To make the authenticators work, you can use a string expansion
 expression like one of the examples in &<<CHAPplaintext>>&.
 

+Beware that the sequence of the parameters to PLAIN and LOGIN differ; the
+usercode and password are in different positions.  &<<CHAPplaintext>>&
+covers both.
+

 .ecindex IIDconfiwal
 
 
 .ecindex IIDconfiwal
 
 


@@ -6128,7 +6166,7 @@ IPv6 addresses must be enclosed in quotes to prevent the first internal colon
 being interpreted as a key terminator. For example:
 .code
 1.2.3.4:           data for 1.2.3.4
 being interpreted as a key terminator. For example:
 .code
 1.2.3.4:           data for 1.2.3.4

-192.168.0.0/16     data for 192.168.0.0/16
+192.168.0.0/16:    data for 192.168.0.0/16

 "abcd::cdab":      data for abcd::cdab
 "abcd:abcd::/32"   data for abcd:abcd::/32
 .endd
 "abcd::cdab":      data for abcd::cdab
 "abcd:abcd::/32"   data for abcd:abcd::/32
 .endd


@@ -6620,6 +6658,20 @@ ${lookup dnsdb{>: a=host1.example}}
 It is permitted to specify a space as the separator character. Further
 white space is ignored.
 
 It is permitted to specify a space as the separator character. Further
 white space is ignored.
 

+.new
+.cindex "TXT record" "in &(dnsdb)& lookup"
+For TXT records with multiple items of data, only the first item is returned,
+unless a separator for them is specified using a comma after the separator
+character followed immediately by the TXT record item separator. To concatenate
+items without a separator, use a semicolon instead.
+.code
+${lookup dnsdb{>\n,: txt=a.b.example}}
+${lookup dnsdb{>\n; txt=a.b.example}}
+.endd
+It is permitted to specify a space as the separator character. Further
+white space is ignored.
+.wen
+

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


@@ -9571,6 +9623,32 @@ For single-key lookup types, no quoting is ever necessary and this operator
 yields an unchanged string.
 
 
 yields an unchanged string.
 
 

+.vitem &*${randint:*&<&'n'&>&*}*&
+.cindex "random number"
+This operator returns a somewhat random number which is less than the
+supplied number and is at least 0.  The quality of this randomness depends
+on how Exim was built; the values are not suitable for keying material.
+If Exim is linked against OpenSSL then RAND_pseudo_bytes() is used.
+Otherwise, the implementation may be arc4random(), random() seeded by
+srandomdev() or srandom(), or a custom implementation even weaker than
+random().
+
+
+.vitem &*${reverse_ip:*&<&'ipaddr'&>&*}*&
+.cindex "expansion" "IP address"
+This operator reverses an IP address; for IPv4 addresses, the result is in
+dotted-quad decimal form, while for IPv6 addreses the result is in
+dotted-nibble hexadecimal form.  In both cases, this is the "natural" form
+for DNS.  For example,
+.code
+${reverse_ip:192.0.2.4} and ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
+.endd
+returns
+.code
+4.2.0.192 and 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
+.endd
+
+

 .vitem &*${rfc2047:*&<&'string'&>&*}*&
 .cindex "expansion" "RFC 2047"
 .cindex "RFC 2047" "expansion operator"
 .vitem &*${rfc2047:*&<&'string'&>&*}*&
 .cindex "expansion" "RFC 2047"
 .cindex "RFC 2047" "expansion operator"


@@ -9732,6 +9810,33 @@ lower case), signifying multiplication by 1024 or 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.
 

+.vitem &*bool&~{*&<&'string'&>&*}*&
+.cindex "expansion" "boolean parsing"
+.cindex "&%bool%& expansion condition"
+This condition turns a string holding a true or false representation into
+a boolean state.  It parses &"true"&, &"false"&, &"yes"& and &"no"&
+(case-insensitively); also positive integer numbers map to true if non-zero,
+false if zero.  Leading and trailing whitespace is ignored.
+All other string values will result in expansion failure.
+
+When combined with ACL variables, this expansion condition will let you
+make decisions in one place and act on those decisions in another place.
+For example:
+.code
+${if bool{$acl_m_privileged_sender} ...
+.endd
+
+.vitem &*bool_lax&~{*&<&'string'&>&*}*&
+.cindex "expansion" "boolean parsing"
+.cindex "&%bool_lax%& expansion condition"
+Like &%bool%&, this condition turns a string into a boolean state.  But
+where &%bool%& accepts a strict set of strings, &%bool_lax%& uses the same
+loose definition that the Router &%condition%& option uses.  The empty string
+and the values &"false"&, &"no"& and &"0"& map to false, all others map to
+true.  Leading and trailing whitespace is ignored.
+
+Note that where &"bool{00}"& is false, &"bool_lax{00}"& is true.
+

 .vitem &*crypteq&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*&
 .cindex "expansion" "encrypted comparison"
 .cindex "encrypted strings, comparing"
 .vitem &*crypteq&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*&
 .cindex "expansion" "encrypted comparison"
 .cindex "encrypted strings, comparing"


@@ -10183,6 +10288,10 @@ configuration, you might have this:
 .code
 server_condition = ${if pwcheck{$auth1:$auth2}}
 .endd
 .code
 server_condition = ${if pwcheck{$auth1:$auth2}}
 .endd

+Again, for a PLAIN authenticator configuration, this would be:
+.code
+server_condition = ${if pwcheck{$auth2:$auth3}}
+.endd

 .vitem &*queue_running*&
 .cindex "queue runner" "detecting when delivering from"
 .cindex "expansion" "queue runner test"
 .vitem &*queue_running*&
 .cindex "queue runner" "detecting when delivering from"
 .cindex "expansion" "queue runner test"


@@ -10970,7 +11079,7 @@ precise size of the file that has been written. See also
 &$message_body_size$&, &$body_linecount$&, and &$body_zerocount$&.
 
 .cindex "RCPT" "value of &$message_size$&"
 &$message_body_size$&, &$body_linecount$&, and &$body_zerocount$&.
 
 .cindex "RCPT" "value of &$message_size$&"

-While running an ACL at the time of an SMTP RCPT command, &$message_size$&
+While running a per message ACL (mail/rcpt/predata), &$message_size$&

 contains the size supplied on the MAIL command, or -1 if no size was given. The
 value may not, of course, be truthful.
 
 contains the size supplied on the MAIL command, or -1 if no size was given. The
 value may not, of course, be truthful.
 


@@ -12284,6 +12393,7 @@ listed in more than one group.
 .row &%acl_smtp_auth%&               "ACL for AUTH"
 .row &%acl_smtp_connect%&            "ACL for connection"
 .row &%acl_smtp_data%&               "ACL for DATA"
 .row &%acl_smtp_auth%&               "ACL for AUTH"
 .row &%acl_smtp_connect%&            "ACL for connection"
 .row &%acl_smtp_data%&               "ACL for DATA"

+.row &%acl_smtp_dkim%&               "ACL for DKIM verification"

 .row &%acl_smtp_etrn%&               "ACL for ETRN"
 .row &%acl_smtp_expn%&               "ACL for EXPN"
 .row &%acl_smtp_helo%&               "ACL for EHLO or HELO"
 .row &%acl_smtp_etrn%&               "ACL for ETRN"
 .row &%acl_smtp_expn%&               "ACL for EXPN"
 .row &%acl_smtp_helo%&               "ACL for EHLO or HELO"


@@ -12338,6 +12448,8 @@ listed in more than one group.
 .row &%gnutls_require_kx%&           "control GnuTLS key exchanges"
 .row &%gnutls_require_mac%&          "control GnuTLS MAC algorithms"
 .row &%gnutls_require_protocols%&    "control GnuTLS protocols"
 .row &%gnutls_require_kx%&           "control GnuTLS key exchanges"
 .row &%gnutls_require_mac%&          "control GnuTLS MAC algorithms"
 .row &%gnutls_require_protocols%&    "control GnuTLS protocols"

+.row &%gnutls_compat_mode%&          "use GnuTLS compatibility mode"
+.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_advertise_hosts%&         "advertise TLS to these hosts"
 .row &%tls_certificate%&             "location of server certificate"
 .row &%tls_crl%&                     "certificate revocation list"


@@ -12743,7 +12855,7 @@ It specifies which anti-virus scanner to use. The default value is:
 .code
 sophie:/var/run/sophie
 .endd
 .code
 sophie:/var/run/sophie
 .endd

-If the value of &%av_scanner%& starts with dollar character, it is expanded
+If the value of &%av_scanner%& starts with a dollar character, it is expanded

 before use. See section &<<SECTscanvirus>>& for further details.
 
 
 before use. See section &<<SECTscanvirus>>& for further details.
 
 


@@ -13337,6 +13449,10 @@ server. For details, see section &<<SECTreqciphgnu>>&.
 This option controls the protocols when GnuTLS is used in an Exim
 server. For details, see section &<<SECTreqciphgnu>>&.
 
 This option controls the protocols when GnuTLS is used in an Exim
 server. For details, see section &<<SECTreqciphgnu>>&.
 

+.option gnutls_compat_mode main boolean unset
+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.

 
 .option headers_charset main string "see below"
 This option sets a default character set for translating from encoded MIME
 
 .option headers_charset main string "see below"
 This option sets a default character set for translating from encoded MIME


@@ -13408,10 +13524,10 @@ do.
 By default, Exim just checks the syntax of HELO and EHLO commands (see
 &%helo_accept_junk_hosts%& and &%helo_allow_chars%&). However, some sites like
 to do more extensive checking of the data supplied by these commands. The ACL
 By default, Exim just checks the syntax of HELO and EHLO commands (see
 &%helo_accept_junk_hosts%& and &%helo_allow_chars%&). However, some sites like
 to do more extensive checking of the data supplied by these commands. The ACL

-condition &`verify`& &`=`& &`helo`& is provided to make this possible.
+condition &`verify = helo`& is provided to make this possible.

 Formerly, it was necessary also to set this option (&%helo_try_verify_hosts%&)
 to force the check to occur. From release 4.53 onwards, this is no longer
 Formerly, it was necessary also to set this option (&%helo_try_verify_hosts%&)
 to force the check to occur. From release 4.53 onwards, this is no longer

-necessary. If the check has not been done before &`verify`& &`=`& &`helo`& is
+necessary. If the check has not been done before &`verify = helo`& is

 encountered, it is done at that time. Consequently, this option is obsolete.
 Its specification is retained here for backwards compatibility.
 
 encountered, it is done at that time. Consequently, this option is obsolete.
 Its specification is retained here for backwards compatibility.
 


@@ -13433,7 +13549,7 @@ available) yields the calling host address.
 
 However, the EHLO or HELO command is not rejected if any of the checks
 fail. Processing continues, but the result of the check is remembered, and can
 
 However, the EHLO or HELO command is not rejected if any of the checks
 fail. Processing continues, but the result of the check is remembered, and can

-be detected later in an ACL by the &`verify`& &`=`& &`helo`& condition.
+be detected later in an ACL by the &`verify = helo`& condition.

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


@@ -13489,8 +13605,8 @@ this check fails, Exim behaves as if the name lookup failed.
 .vindex "&$sender_host_name$&"
 After any kind of failure, the host name (in &$sender_host_name$&) remains
 unset, and &$host_lookup_failed$& is set to the string &"1"&. See also
 .vindex "&$sender_host_name$&"
 After any kind of failure, the host name (in &$sender_host_name$&) remains
 unset, and &$host_lookup_failed$& is set to the string &"1"&. See also

-&%dns_again_means_nonexist%&, &%helo_lookup_domains%&, and &`verify`& &`=`&
-&`reverse_host_lookup`& in ACLs.
+&%dns_again_means_nonexist%&, &%helo_lookup_domains%&, and
+&`verify = reverse_host_lookup`& in ACLs.

 
 
 .option host_lookup_order main "string list" &`bydns:byaddr`&
 
 
 .option host_lookup_order main "string list" &`bydns:byaddr`&


@@ -13893,6 +14009,14 @@ an oversized message is logged in both the main and the reject logs. See also
 the generic transport option &%message_size_limit%&, which limits the size of
 message that an individual transport can process.
 
 the generic transport option &%message_size_limit%&, which limits the size of
 message that an individual transport can process.
 

+If you use a virus-scanner and set this option to to a value larger than the
+maximum size that your virus-scanner is configured to support, you may get
+failures triggered by large mails.  The right size to configure for the
+virus-scanner depends upon what data is passed and the options in use but it's
+probably safest to just set it to a little larger than this value.  Eg, with a
+default Exim message size of 50M and a default ClamAV StreamMaxLength of 10M,
+some problems may result.
+

 
 .option move_frozen_messages main boolean false
 .cindex "frozen messages" "moving"
 
 .option move_frozen_messages main boolean false
 .cindex "frozen messages" "moving"


@@ -13945,6 +14069,36 @@ harm. This option overrides the &%pipe_as_creator%& option of the &(pipe)&
 transport driver.
 
 
 transport driver.
 
 

+.option openssl_options main "string list" +dont_insert_empty_fragments
+.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,
+each one to be +added or -subtracted from the current value.  The default
+value is one option which happens to have been set historically.  You can
+remove all options with:
+.code
+openssl_options = -all
+.endd
+This option is only available if Exim is built against OpenSSL.  The values
+available for this option vary according to the age of your OpenSSL install.
+The &"all"& value controls a subset of flags which are available, typically
+the bug workaround options.  The &'SSL_CTX_set_options'& man page will
+list the values known on your system and Exim should support all the
+&"bug workaround"& options and many of the &"modifying"& options.  The Exim
+names lose the leading &"SSL_OP_"& and are lower-cased.
+
+Note that adjusting the options can have severe impact upon the security of
+SSL as used by Exim.  It is possible to disable safety checks and shoot
+yourself in the foot in various unpleasant ways.  This option should not be
+adjusted lightly.  An unrecognised item will be detected at by invoking Exim
+with the &%-bV%& flag.
+
+An example:
+.code
+openssl_options = -all +microsoft_big_sslv3_buffer
+.endd
+
+

 .option oracle_servers main "string list" unset
 .cindex "Oracle" "server list"
 This option provides a list of Oracle servers and associated connection data,
 .option oracle_servers main "string list" unset
 .cindex "Oracle" "server list"
 This option provides a list of Oracle servers and associated connection data,


@@ -15540,6 +15694,9 @@ router is skipped, and the address is offered to the next one.
 If the result is any other value, the router is run (as this is the last
 precondition to be evaluated, all the other preconditions must be true).
 
 If the result is any other value, the router is run (as this is the last
 precondition to be evaluated, all the other preconditions must be true).
 

+This option is unique in that multiple &%condition%& options may be present.
+All &%condition%& options must succeed.
+

 The &%condition%& option provides a means of applying custom conditions to the
 running of routers. Note that in the case of a simple conditional expansion,
 the default expansion values are exactly what is wanted. For example:
 The &%condition%& option provides a means of applying custom conditions to the
 running of routers. Note that in the case of a simple conditional expansion,
 the default expansion values are exactly what is wanted. For example:


@@ -15550,6 +15707,12 @@ Because of the default behaviour of the string expansion, this is equivalent to
 .code
 condition = ${if >{$message_age}{600}{true}{}}
 .endd
 .code
 condition = ${if >{$message_age}{600}{true}{}}
 .endd

+A multiple condition example, which succeeds:
+.code
+condition = ${if >{$message_age}{600}}
+condition = ${if !eq{${lc:$local_part}}{postmaster}}
+condition = foobar
+.endd

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


@@ -17810,10 +17973,10 @@ redirection items of the form
 :defer:
 :fail:
 .endd
 :defer:
 :fail:
 .endd

-respectively. When a redirection list contains such an item, it applies to the
-entire redirection; any other items in the list are ignored (&':blackhole:'& is
-different). Any text following &':fail:'& or &':defer:'& is placed in the error
-text associated with the failure. For example, an alias file might contain:
+respectively. When a redirection list contains such an item, it applies
+to the entire redirection; any other items in the list are ignored. Any
+text following &':fail:'& or &':defer:'& is placed in the error text
+associated with the failure. For example, an alias file might contain:

 .code
 X.Employee:  :fail: Gone away, no forwarding address
 .endd
 .code
 X.Employee:  :fail: Gone away, no forwarding address
 .endd


@@ -20986,6 +21149,17 @@ sought in the PATH directories, in the usual way. &*Warning*&: This does not
 apply to a command specified as a transport filter.
 
 
 apply to a command specified as a transport filter.
 
 

+.option permit_coredump pipe boolean false
+Normally Exim inhibits core-dumps during delivery.  If you have a need to get
+a core-dump of a pipe command, enable this command.  This enables core-dumps
+during delivery and affects both the Exim binary and the pipe command run.
+It is recommended that this option remain off unless and until you have a need
+for it and that this only be enabled when needed, as the risk of excessive
+resource consumption can be quite high.  Note also that Exim is typically
+installed as a setuid binary and most operating systems will inhibit coredumps
+of these by default, so further OS-specific action may be required.
+
+

 .option pipe_as_creator pipe boolean false
 .cindex "uid (user id)" "local delivery"
 If the generic &%user%& option is not set and this option is true, the delivery
 .option pipe_as_creator pipe boolean false
 .cindex "uid (user id)" "local delivery"
 If the generic &%user%& option is not set and this option is true, the delivery


@@ -21126,6 +21300,7 @@ procmail_pipe:
   envelope_to_add
   check_string = "From "
   escape_string = ">From "
   envelope_to_add
   check_string = "From "
   escape_string = ">From "

+  umask = 077

   user = $local_part
   group = mail
 
   user = $local_part
   group = mail
 


@@ -21425,18 +21600,23 @@ being used, names are looked up using &[gethostbyname()]&
 instead of using the DNS. Of course, that function may in fact use the DNS, but
 it may also consult other sources of information such as &_/etc/hosts_&.
 
 instead of using the DNS. Of course, that function may in fact use the DNS, but
 it may also consult other sources of information such as &_/etc/hosts_&.
 

-.option gnutls_require_kx main string unset
+.option gnutls_require_kx smtp string unset

 This option controls the key exchange mechanisms when GnuTLS is used in an Exim
 client. For details, see section &<<SECTreqciphgnu>>&.
 
 This option controls the key exchange mechanisms when GnuTLS is used in an Exim
 client. For details, see section &<<SECTreqciphgnu>>&.
 

-.option gnutls_require_mac main string unset
+.option gnutls_require_mac smtp string unset

 This option controls the MAC algorithms when GnuTLS is used in an Exim
 client. For details, see section &<<SECTreqciphgnu>>&.
 
 This option controls the MAC algorithms when GnuTLS is used in an Exim
 client. For details, see section &<<SECTreqciphgnu>>&.
 

-.option gnutls_require_protocols main string unset
+.option gnutls_require_protocols smtp string unset

 This option controls the protocols when GnuTLS is used in an Exim
 client. For details, see section &<<SECTreqciphgnu>>&.
 
 This option controls the protocols when GnuTLS is used in an Exim
 client. For details, see section &<<SECTreqciphgnu>>&.
 

+.option gnutls_compat_mode smtp boolean unset
+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.
+

 .option helo_data smtp string&!! "see below"
 .cindex "HELO" "argument, setting"
 .cindex "EHLO" "argument, setting"
 .option helo_data smtp string&!! "see below"
 .cindex "HELO" "argument, setting"
 .cindex "EHLO" "argument, setting"


@@ -23538,7 +23718,6 @@ the password conform to the Exim syntax. At the LDAP level, the password is an
 uninterpreted string.
 
 
 uninterpreted string.
 
 

-

 .section "Support for different kinds of authentication" "SECID174"
 A number of string expansion features are provided for the purpose of
 interfacing to different ways of user authentication. These include checking
 .section "Support for different kinds of authentication" "SECID174"
 A number of string expansion features are provided for the purpose of
 interfacing to different ways of user authentication. These include checking


@@ -23797,7 +23976,7 @@ sasl_cram_md5:
 sasl_plain:
   driver = cyrus_sasl
   public_name = PLAIN
 sasl_plain:
   driver = cyrus_sasl
   public_name = PLAIN

-  server_set_id = $auth1
+  server_set_id = $auth2

 .endd
 Cyrus SASL does implement the LOGIN authentication method, even though it is
 not a standard method. It is disabled by default in the source distribution,
 .endd
 Cyrus SASL does implement the LOGIN authentication method, even though it is
 not a standard method. It is disabled by default in the source distribution,


@@ -23830,7 +24009,7 @@ dovecot_plain:
   driver = dovecot
   public_name = PLAIN
   server_socket = /var/run/dovecot/auth-client
   driver = dovecot
   public_name = PLAIN
   server_socket = /var/run/dovecot/auth-client

-  server_set_id = $auth1
+  server_set_id = $auth2

 
 dovecot_ntlm:
   driver = dovecot
 
 dovecot_ntlm:
   driver = dovecot


@@ -24413,13 +24592,10 @@ unencrypted.
 The &%tls_certificate%& and &%tls_privatekey%& options of the &(smtp)&
 transport provide the client with a certificate, which is passed to the server
 if it requests it. If the server is Exim, it will request a certificate only if
 The &%tls_certificate%& and &%tls_privatekey%& options of the &(smtp)&
 transport provide the client with a certificate, which is passed to the server
 if it requests it. If the server is Exim, it will request a certificate only if

-&%tls_verify_hosts%& or &%tls_try_verify_hosts%& matches the client. &*Note*&:
-These options must be set in the &(smtp)& transport for Exim to use TLS when it
-is operating as a client. Exim does not assume that a server certificate (set
-by the global options of the same name) should also be used when operating as a
-client.
+&%tls_verify_hosts%& or &%tls_try_verify_hosts%& matches the client.

 
 

-If &%tls_verify_certificates%& is set, it must name a file or,
+If the &%tls_verify_certificates%& option is set on the &(smtp)& transport, it
+must name a file or,

 for OpenSSL only (not GnuTLS), a directory, that contains a collection of
 expected server certificates. The client verifies the server's certificate
 against this collection, taking into account any revoked certificates that are
 for OpenSSL only (not GnuTLS), a directory, that contains a collection of
 expected server certificates. The client verifies the server's certificate
 against this collection, taking into account any revoked certificates that are


@@ -24431,6 +24607,12 @@ list of permitted cipher suites. If either of these checks fails, delivery to
 the current host is abandoned, and the &(smtp)& transport tries to deliver to
 alternative hosts, if any.
 
 the current host is abandoned, and the &(smtp)& transport tries to deliver to
 alternative hosts, if any.
 

+ &*Note*&:
+These options must be set in the &(smtp)& transport for Exim to use TLS when it
+is operating as a client. Exim does not assume that a server certificate (set
+by the global options of the same name) should also be used when operating as a
+client.
+

 .vindex "&$host$&"
 .vindex "&$host_address$&"
 All the TLS options in the &(smtp)& transport are expanded before use, with
 .vindex "&$host$&"
 .vindex "&$host_address$&"
 All the TLS options in the &(smtp)& transport are expanded before use, with


@@ -24765,7 +24947,6 @@ client are given temporary error responses until QUIT is received or the
 connection is closed. In these special cases, the QUIT ACL does not run.
 
 
 connection is closed. In these special cases, the QUIT ACL does not run.
 
 

-

 .section "The not-QUIT ACL" "SECTNOTQUITACL"
 .vindex &$acl_smtp_notquit$&
 The not-QUIT ACL, specified by &%acl_smtp_notquit%&, is run in most cases when
 .section "The not-QUIT ACL" "SECTNOTQUITACL"
 .vindex &$acl_smtp_notquit$&
 The not-QUIT ACL, specified by &%acl_smtp_notquit%&, is run in most cases when


@@ -25631,6 +25812,23 @@ warn  control = caseful_local_part
 Notice that we put back the lower cased version afterwards, assuming that
 is what is wanted for subsequent tests.
 
 Notice that we put back the lower cased version afterwards, assuming that
 is what is wanted for subsequent tests.
 

+.vitem &*control&~=&~debug/*&<&'options'&>
+.cindex "&ACL;" "enabling debug logging"
+.cindex "debugging" "enabling from an ACL"
+This control turns on debug logging, almost as though Exim had been invoked
+with &`-d`&, with the output going to a new logfile, by default called
+&'debuglog'&.  The filename can be adjusted with the &'tag'& option, which
+may access any variables already defined.  The logging may be adjusted with
+the &'opts'& option, which takes the same values as the &`-d`& command-line
+option.  Some examples (which depend on variables that don't exist in all
+contexts):
+.code
+      control = debug
+      control = debug/tag=.$sender_host_address
+      control = debug/opts=+expand+acl
+      control = debug/tag=.$message_exim_id/opts=+expand
+.endd
+

 .vitem &*control&~=&~enforce_sync*& &&&
        &*control&~=&~no_enforce_sync*&
 .cindex "SMTP" "synchronization checking"
 .vitem &*control&~=&~enforce_sync*& &&&
        &*control&~=&~no_enforce_sync*&
 .cindex "SMTP" "synchronization checking"


@@ -25766,7 +25964,7 @@ This control is permitted only for the MAIL, RCPT, and start of data ACLs (the
 latter is the one defined by &%acl_smtp_predata%&). Setting it tells Exim that
 the current message is a submission from a local MUA. In this case, Exim
 operates in &"submission mode"&, and applies certain fixups to the message if
 latter is the one defined by &%acl_smtp_predata%&). Setting it tells Exim that
 the current message is a submission from a local MUA. In this case, Exim
 operates in &"submission mode"&, and applies certain fixups to the message if

-necessary. For example, it add a &'Date:'& header line if one is not present.
+necessary. For example, it adds a &'Date:'& header line if one is not present.

 This control is not permitted in the &%acl_smtp_data%& ACL, because that is too
 late (the message has already been created).
 
 This control is not permitted in the &%acl_smtp_data%& ACL, because that is too
 late (the message has already been created).
 


@@ -25779,7 +25977,7 @@ that may be received in the same SMTP connection.
 .vitem &*control&~=&~suppress_local_fixups*&
 .cindex "submission fixups, suppressing"
 This control applies to locally submitted (non TCP/IP) messages, and is the
 .vitem &*control&~=&~suppress_local_fixups*&
 .cindex "submission fixups, suppressing"
 This control applies to locally submitted (non TCP/IP) messages, and is the

-complement of &`control`& &`=`& &`submission`&. It disables the fixups that are
+complement of &`control = submission`&. It disables the fixups that are

 normally applied to locally-submitted messages. Specifically:
 
 .ilist
 normally applied to locally-submitted messages. Specifically:
 
 .ilist


@@ -25808,12 +26006,12 @@ All four possibilities for message fixups can be specified:
 .ilist
 Locally submitted, fixups applied: the default.
 .next
 .ilist
 Locally submitted, fixups applied: the default.
 .next

-Locally submitted, no fixups applied: use &`control`& &`=`&
-&`suppress_local_fixups`&.
+Locally submitted, no fixups applied: use
+&`control = suppress_local_fixups`&.

 .next
 Remotely submitted, no fixups applied: the default.
 .next
 .next
 Remotely submitted, no fixups applied: the default.
 .next

-Remotely submitted, fixups applied: use &`control`& &`=`& &`submission`&.
+Remotely submitted, fixups applied: use &`control = submission`&.

 .endlist
 
 
 .endlist
 
 


@@ -26959,7 +27157,7 @@ entry must set the rate for the same key (otherwise it will always be zero).
 For example:
 .code
 acl_check_connect:
 For example:
 .code
 acl_check_connect:

-  deny ratelimit = 100 / 5m / strict / noupdate
+  deny ratelimit = 100 / 5m / strict / per_cmd / noupdate

        log_message = RATE: $sender_rate/$sender_rate_period \
                      (max $sender_rate_limit)
 .endd
        log_message = RATE: $sender_rate/$sender_rate_period \
                      (max $sender_rate_limit)
 .endd


@@ -27753,7 +27951,7 @@ If you do not set &%av_scanner%&, it defaults to
 .code
 av_scanner = sophie:/var/run/sophie
 .endd
 .code
 av_scanner = sophie:/var/run/sophie
 .endd

-If the value of &%av_scanner%& starts with dollar character, it is expanded
+If the value of &%av_scanner%& starts with a dollar character, it is expanded

 before use. The following scanner types are supported in this release:
 
 .vlist
 before use. The following scanner types are supported in this release:
 
 .vlist


@@ -27777,8 +27975,16 @@ required: either the path and name of a UNIX socket file, or a hostname or IP
 number, and a port, separated by space, as in the second of these examples:
 .code
 av_scanner = clamd:/opt/clamd/socket
 number, and a port, separated by space, as in the second of these examples:
 .code
 av_scanner = clamd:/opt/clamd/socket

-av_scanner = clamd:192.168.2.100 1234
-.endd
+av_scanner = clamd:192.0.2.3 1234
+av_scanner = clamd:192.0.2.3 1234:local
+.endd
+If the value of av_scanner points to a UNIX socket file or contains the local
+keyword, then the ClamAV interface will pass a filename containing the data
+to be scanned, which will should normally result in less I/O happening and be
+more efficient.  Normally in the TCP case, the data is streamed to ClamAV as
+Exim does not assume that there is a common filesystem with the remote host.
+There is an option WITH_OLD_CLAMAV_STREAM in &_src/EDITME_& available, should
+you be running a version of ClamAV prior to 0.95.

 If the option is unset, the default is &_/tmp/clamd_&. Thanks to David Saez for
 contributing the code for this scanner.
 
 If the option is unset, the default is &_/tmp/clamd_&. Thanks to David Saez for
 contributing the code for this scanner.
 


@@ -27918,6 +28124,9 @@ If your virus scanner cannot unpack MIME and TNEF containers itself, you should
 use the &%demime%& condition (see section &<<SECTdemimecond>>&) before the
 &%malware%& condition.
 
 use the &%demime%& condition (see section &<<SECTdemimecond>>&) before the
 &%malware%& condition.
 

+Beware the interaction of Exim's &%message_size_limit%& with any size limits
+imposed by your anti-virus scanner.
+

 Here is a very simple scanning example:
 .code
 deny message = This message contains malware ($malware_name)
 Here is a very simple scanning example:
 .code
 deny message = This message contains malware ($malware_name)


@@ -28040,9 +28249,8 @@ it always return &"true"& by appending &`:true`& to the username.
 
 .cindex "spam scanning" "returned variables"
 When the &%spam%& condition is run, it sets up a number of expansion
 
 .cindex "spam scanning" "returned variables"
 When the &%spam%& condition is run, it sets up a number of expansion

-variables. With the exception of &$spam_score_int$&, these are usable only
-within ACLs; their values are not retained with the message and so cannot be
-used at delivery time.
+variables. These variables are saved with the received message, thus they are
+available for use at delivery time.

 
 .vlist
 .vitem &$spam_score$&
 
 .vlist
 .vitem &$spam_score$&


@@ -28053,11 +28261,8 @@ for inclusion in log or reject messages.
 The spam score of the message, multiplied by ten, as an integer value. For
 example &"34"& or &"305"&. It may appear to disagree with &$spam_score$&
 because &$spam_score$& is rounded and &$spam_score_int$& is truncated.
 The spam score of the message, multiplied by ten, as an integer value. For
 example &"34"& or &"305"&. It may appear to disagree with &$spam_score$&
 because &$spam_score$& is rounded and &$spam_score_int$& is truncated.

-The integer value is useful for numeric comparisons in
-conditions. This variable is special; its value is saved with the message, and
-written to Exim's spool file. This means that it can be used during the whole
-life of the message on your Exim system, in particular, in routers or
-transports during the later delivery phase.
+The integer value is useful for numeric comparisons in conditions.
+

 
 .vitem &$spam_bar$&
 A string consisting of a number of &"+"& or &"-"& characters, representing the
 
 .vitem &$spam_bar$&
 A string consisting of a number of &"+"& or &"-"& characters, representing the


@@ -30257,8 +30462,8 @@ If a message contains a number of different addresses, all those with the same
 characteristics (for example, the same envelope sender) that resolve to the
 same set of hosts, in the same order, are sent in a single SMTP transaction,
 even if they are for different domains, unless there are more than the setting
 characteristics (for example, the same envelope sender) that resolve to the
 same set of hosts, in the same order, are sent in a single SMTP transaction,
 even if they are for different domains, unless there are more than the setting

-of the &%max_rcpts%& option in the &(smtp)& transport allows, in which case
-they are split into groups containing no more than &%max_rcpts%& addresses
+of the &%max_rcpt%&s option in the &(smtp)& transport allows, in which case
+they are split into groups containing no more than &%max_rcpt%&s addresses

 each. If &%remote_max_parallel%& is greater than one, such groups may be sent
 in parallel sessions. The order of hosts with identical MX values is not
 significant when checking whether addresses can be batched in this way.
 each. If &%remote_max_parallel%& is greater than one, such groups may be sent
 in parallel sessions. The order of hosts with identical MX values is not
 significant when checking whether addresses can be batched in this way.


@@ -34284,7 +34489,7 @@ It can co-exist with all other Exim features, including transport filters.
 .next
 Verify signatures in incoming messages: This is implemented by an additional
 ACL (acl_smtp_dkim), which can be called several times per message, with
 .next
 Verify signatures in incoming messages: This is implemented by an additional
 ACL (acl_smtp_dkim), which can be called several times per message, with

-different signature context.
+different signature contexts.

 .endlist
 
 In typical Exim style, the verification implementation does not include any
 .endlist
 
 In typical Exim style, the verification implementation does not include any


@@ -34312,19 +34517,19 @@ Signing is implemented by setting private options on the SMTP transport.
 These options take (expandable) strings as arguments.
 
 .option dkim_domain smtp string&!! unset
 These options take (expandable) strings as arguments.
 
 .option dkim_domain smtp string&!! unset

-MANDATORY
+MANDATORY:

 The domain you want to sign with. The result of this expanded
 option is put into the &%$dkim_domain%& expansion variable.
 
 .option dkim_selector smtp string&!! unset
 The domain you want to sign with. The result of this expanded
 option is put into the &%$dkim_domain%& expansion variable.
 
 .option dkim_selector smtp string&!! unset

-MANDATORY
+MANDATORY:

 This sets the key selector string. You can use the &%$dkim_domain%& expansion
 variable to look up a matching selector. The result is put in the expansion
 variable &%$dkim_selector%& which should be used in the &%dkim_private_key%&
 option along with &%$dkim_domain%&.
 
 .option dkim_private_key smtp string&!! unset
 This sets the key selector string. You can use the &%$dkim_domain%& expansion
 variable to look up a matching selector. The result is put in the expansion
 variable &%$dkim_selector%& which should be used in the &%dkim_private_key%&
 option along with &%$dkim_domain%&.
 
 .option dkim_private_key smtp string&!! unset

-MANDATORY
+MANDATORY:

 This sets the private key to use. You can use the &%$dkim_domain%& and
 &%$dkim_selector%& expansion variables to determine the private key to use.
 The result can either
 This sets the private key to use. You can use the &%$dkim_domain%& and
 &%$dkim_selector%& expansion variables to determine the private key to use.
 The result can either


@@ -34340,14 +34545,14 @@ is set.
 .endlist
 
 .option dkim_canon smtp string&!! unset
 .endlist
 
 .option dkim_canon smtp string&!! unset

-OPTIONAL
+OPTIONAL:

 This option sets the canonicalization method used when signing a message.
 The DKIM RFC currently supports two methods: "simple" and "relaxed".
 The option defaults to "relaxed" when unset. Note: the current implementation
 only supports using the same canonicalization method for both headers and body.
 
 .option dkim_strict smtp string&!! unset
 This option sets the canonicalization method used when signing a message.
 The DKIM RFC currently supports two methods: "simple" and "relaxed".
 The option defaults to "relaxed" when unset. Note: the current implementation
 only supports using the same canonicalization method for both headers and body.
 
 .option dkim_strict smtp string&!! unset

-OPTIONAL
+OPTIONAL:

 This  option  defines  how  Exim  behaves  when  signing a message that
 should be signed fails for some reason.  When the expansion evaluates to
 either "1" or "true", Exim will defer. Otherwise Exim will send the message
 This  option  defines  how  Exim  behaves  when  signing a message that
 should be signed fails for some reason.  When the expansion evaluates to
 either "1" or "true", Exim will defer. Otherwise Exim will send the message


@@ -34355,7 +34560,7 @@ unsigned. You can use the &%$dkim_domain%& and &%$dkim_selector%& expansion
 variables here.
 
 .option dkim_sign_headers smtp string&!! unset
 variables here.
 
 .option dkim_sign_headers smtp string&!! unset

-OPTIONAL
+OPTIONAL:

 When set, this option must expand to (or be specified as) a colon-separated
 list of header names. Headers with these names will be included in the message
 signature. When unspecified, the header names recommended in RFC4871 will be
 When set, this option must expand to (or be specified as) a colon-separated
 list of header names. Headers with these names will be included in the message
 signature. When unspecified, the header names recommended in RFC4871 will be


@@ -34376,39 +34581,48 @@ runtime of the ACL.
 Calling the ACL only for existing signatures is not sufficient to build
 more advanced policies. For that reason, the global option
 &%dkim_verify_signers%&, and a global expansion variable
 Calling the ACL only for existing signatures is not sufficient to build
 more advanced policies. For that reason, the global option
 &%dkim_verify_signers%&, and a global expansion variable

-&%$dkim_signing_domains%& exist.
+&%$dkim_signers%& exist.

 
 The global option &%dkim_verify_signers%& can be set to a colon-separated
 list of DKIM domains or identities for which the ACL &%acl_smtp_dkim%& is
 called. It is expanded when the message has been received. At this point,
 
 The global option &%dkim_verify_signers%& can be set to a colon-separated
 list of DKIM domains or identities for which the ACL &%acl_smtp_dkim%& is
 called. It is expanded when the message has been received. At this point,

-the expansion variable &%$dkim_signing_domains%& already contains a colon-
-separated list of signer domains for the message. When &%dkim_verify_signers%&
-is not specified in the main configuration, it defaults as:
+the expansion variable &%$dkim_signers%& already contains a colon-separated
+list of signer domains and identities for the message. When
+&%dkim_verify_signers%& is not specified in the main configuration,
+it defaults as:

 .code
 .code

-dkim_verify_signers = $dkim_signing_domains
+dkim_verify_signers = $dkim_signers

 .endd
 This leads to the default behaviour of calling &%acl_smtp_dkim%& for each
 DKIM signature in the message. Current DKIM verifiers may want to explicitly
 call the ACL for known domains or identities. This would be achieved as follows:
 .code
 .endd
 This leads to the default behaviour of calling &%acl_smtp_dkim%& for each
 DKIM signature in the message. Current DKIM verifiers may want to explicitly
 call the ACL for known domains or identities. This would be achieved as follows:
 .code

-dkim_verify_signers = paypal.com:ebay.com:$dkim_signing_domains
+dkim_verify_signers = paypal.com:ebay.com:$dkim_signers

 .endd
 This would result in &%acl_smtp_dkim%& always being called for "paypal.com"
 .endd
 This would result in &%acl_smtp_dkim%& always being called for "paypal.com"

-and "ebay.com", plus all domains that have signatures in the message. You can
-also be more creative in constructing your policy. Example:
+and "ebay.com", plus all domains and identities that have signatures in the message.
+You can also be more creative in constructing your policy. For example:

 .code
 .code

-dkim_verify_signers = $sender_address_domain:$dkim_signing_domains
+dkim_verify_signers = $sender_address_domain:$dkim_signers

 .endd
 
 .endd
 

+If a domain or identity is listed several times in the (expanded) value of
+&%dkim_verify_signers%&, the ACL is only called once for that domain or identity.
+
+

 Inside the &%acl_smtp_dkim%&, the following expansion variables are
 available (from most to least important):
 
 .vlist
 Inside the &%acl_smtp_dkim%&, the following expansion variables are
 available (from most to least important):
 
 .vlist

+.vitem &%$dkim_cur_signer%&
+The signer that is being evaluated in this ACL run. This can be a domain or
+an identity. This is one of the list items from the expanded main option
+&%dkim_verify_signers%& (see above).

 .vitem &%$dkim_verify_status%&
 A string describing the general status of the signature. One of
 .ilist
 &%none%&: There is no signature in the message for the current domain or
 .vitem &%$dkim_verify_status%&
 A string describing the general status of the signature. One of
 .ilist
 &%none%&: There is no signature in the message for the current domain or

-identity.
+identity (as reflected by &%$dkim_cur_signer%&).

 .next
 &%invalid%&: The signature could not be verified due to a processing error.
 More detail is available in &%$dkim_verify_reason%&.
 .next
 &%invalid%&: The signature could not be verified due to a processing error.
 More detail is available in &%$dkim_verify_reason%&.


@@ -34439,16 +34653,14 @@ DKIM verification. It may of course also mean that the signature is forged.
 .endlist
 .vitem &%$dkim_domain%&
 The signing domain. IMPORTANT: This variable is only populated if there is
 .endlist
 .vitem &%$dkim_domain%&
 The signing domain. IMPORTANT: This variable is only populated if there is

-ab actual signature in the message. It does NOT neccessarily carry the
-domain that is currently being evaluated. Please use the &%dkim_signers%& ACL
-condition for that.
+an actual signature in the message for the current domain or identity (as
+reflected by &%$dkim_cur_signer%&).

 .vitem &%$dkim_identity%&
 .vitem &%$dkim_identity%&

-The signing identity. IMPORTANT: This variable is only populated if there is
-ab actual signature in the message. It does NOT neccessarily carry the
-identity that is currently being evaluated. Please use the &%dkim_signers%& ACL
-condition for that.
+The signing identity, if present. IMPORTANT: This variable is only populated
+if there is an actual signature in the message for the current domain or
+identity (as reflected by &%$dkim_cur_signer%&).

 .vitem &%$dkim_selector%&
 .vitem &%$dkim_selector%&

-The key record selector string
+The key record selector string.

 .vitem &%$dkim_algo%&
 The algorithm used. One of 'rsa-sha1' or 'rsa-sha256'.
 .vitem &%$dkim_canon_body%&
 .vitem &%$dkim_algo%&
 The algorithm used. One of 'rsa-sha1' or 'rsa-sha256'.
 .vitem &%$dkim_canon_body%&


@@ -34483,7 +34695,7 @@ in the key record.
 Key granularity (tag g=) from the key record. Defaults to "*" if not specified
 in the key record.
 .vitem &%$dkim_key_notes%&
 Key granularity (tag g=) from the key record. Defaults to "*" if not specified
 in the key record.
 .vitem &%$dkim_key_notes%&

-Notes from the key record (tag n=)
+Notes from the key record (tag n=).

 .endlist
 
 In addition, two ACL conditions are provided:
 .endlist
 
 In addition, two ACL conditions are provided:


@@ -34491,8 +34703,9 @@ In addition, two ACL conditions are provided:
 .vlist
 .vitem &%dkim_signers%&
 ACL condition that checks a colon-separated list of domains or identities
 .vlist
 .vitem &%dkim_signers%&
 ACL condition that checks a colon-separated list of domains or identities

-for a match against the domain or identity that the ACL is currently verifying.
-This is typically used to restrict an ACL verb to a group of domains or identities, like:
+for a match against the domain or identity that the ACL is currently verifying
+(reflected by &%$dkim_cur_signer%&). This is typically used to restrict an ACL
+verb to a group of domains or identities. For example:

 
 .code
 # Warn when message apparently from GMail has no signature at all
 
 .code
 # Warn when message apparently from GMail has no signature at all


@@ -34519,7 +34732,6 @@ see the documentation of the &%$dkim_verify_status%& expansion variable above
 for more information of what they mean.
 .endlist
 
 for more information of what they mean.
 .endlist
 

-

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