-. $Cambridge: exim/doc/doc-docbook/spec.xfpt,v 1.47 2008/09/29 11:17:46 nm4 Exp $
+. $Cambridge: exim/doc/doc-docbook/spec.xfpt,v 1.50 2009/06/11 14:07:57 tom Exp $
.
. /////////////////////////////////////////////////////////////////////////////
. This is the primary source of the Exim Manual. It is an xfpt document that is
.section "The not-QUIT ACL" "SECTNOTQUITACL"
-The not-QUIT ACL, specified by &%smtp_notquit_acl%&, is run in most cases when
+.vindex &$acl_smtp_notquit$&
+The not-QUIT ACL, specified by &%acl_smtp_notquit%&, is run in most cases when
an SMTP session ends without sending QUIT. However, when Exim itself is is bad
trouble, such as being unable to write to its log files, this ACL is not run,
because it might try to do things (such as write to log files) that make the
.ecindex IIDforspo2
.ecindex IIDforspo3
+. ////////////////////////////////////////////////////////////////////////////
+. ////////////////////////////////////////////////////////////////////////////
+
+.chapter "Support for DKIM (DomainKeys Identified Mail) - RFC4871" "CHID12" &&&
+ "DKIM Support"
+.cindex "DKIM"
+
+Since version 4.70, DKIM support is compiled into Exim by default. It can be
+disabled by setting DISABLE_DKIM=yes in Local/Makefile.
+
+Exim's DKIM implementation allows to
+.olist
+Sign outgoing messages: This function is implemented in the SMTP transport.
+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
+different signature context.
+.endlist
+
+.section "Signing outgoing messages" "SECID513"
+.cindex "DKIM" "signing"
+
+Signing is implemented by setting private options on the SMTP transport.
+These options take (expandable) strings as arguments.
+
+.vitem &%dkim_domain = <expanded string> [MANDATORY]%&
+The domain you want to sign with. The result of this expanded
+option is put into the $dkim_domain expansion variable.
+
+.vitem &%dkim_selector = <expanded string> [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.
+
+.vitem &%dkim_private_key = <expanded string> [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
+.ulist
+be a valid RSA private key in ASCII armor, including line breaks.
+.next
+start with a slash, in which case it is treated as a file that contains
+the private key.
+.next
+be "0", "false" or the empty string, in which case the message will not
+be signed. This case will not result in an error, even if dkim_strict is set.
+.endlist
+
+.vitem &%dkim_canon = <expanded string> [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 support using the same canonicalization method for both headers and body.
+
+.vitem &%dkim_strict = <expanded string> [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
+unsigned. You can use the $dkim_domain and $dkim_selector expansion
+variables here.
+
+.vitem &%dkim_sign_headers = <expanded string> [OPTIONAL]%&
+When set, this option must expand to (or be specified as) a colon-separated
+list of header names. These headers will be included in the message
+signature. When unspecified, the headers recommended in RFC4871 will be used.
+
. ////////////////////////////////////////////////////////////////////////////
. ////////////////////////////////////////////////////////////////////////////
-.chapter "Adding new drivers or lookup types" "CHID12" &&&
+.chapter "Adding new drivers or lookup types" "CHID13" &&&
"Adding drivers or lookups"
.cindex "adding drivers"
.cindex "new drivers, adding"
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