.vitem "&*${authresults{*&<&'authserv-id'&>&*}}*&"
.cindex authentication "results header"
.cindex headers "authentication-results:"
+.cindex authentication "expansion item"
This item returns a string suitable for insertion as an
&'Authentication-Results"'&
header line.
.code
add_header = :at_start:${authresults {$primary_hostname}}
.endd
+This is safe even if no authentication reselts are available.
.wen
the result, the name is not accepted, and &$host_lookup_deferred$& is set to
&"1"&. See also &$sender_host_name$&.
+.new
+.cindex authentication "expansion item"
+Performing these checks sets up information used by the
+&$authresults$& expansion item.
+.wen
+
+
.vitem &$host_lookup_failed$&
.vindex "&$host_lookup_failed$&"
See &$host_lookup_deferred$&.
client from which the message was received. This variable is empty if there was
no successful authentication.
+.new
+.cindex authentication "expansion item"
+Successful authentication sets up information used by the
+&$authresults$& expansion item.
+.wen
+
containing the signature status and its details are set up during the
runtime of the ACL.
+.new
+.cindex authentication "expansion item"
+Performing verification sets up information used by the
+&$authresults$& expansion item.
+.wen
+
Calling the ACL only for existing signatures is not sufficient to build
more advanced policies. For that reason, the global option
&%dkim_verify_signers%&, and a global expansion variable
DNS records is all that is required.
For verification, an ACL condition and an expansion lookup are provided.
+.new
+.cindex authentication "expansion item"
+Performing verification sets up information used by the
+&$authresults$& expansion item.
+.wen
+
.cindex SPF "ACL condition"
.cindex ACL "spf condition"