+.new
+.option spf_smtp_comment_template main string&!! "Please%_see%_http://www.open-spf.org/Why"
+This option is available when Exim is compiled with SPF support. It
+allows the customisation of the SMTP comment that the SPF library
+generates. You are strongly encouraged to link to your own explanative
+site. The following placeholders (along with Exim variables) are allowed
+in the template (this list is compiled from the libspf2 sources):
+.ilist
+&*L*&: Envelope sender's local part.
+.next
+&*S*&: Envelope sender.
+.next
+&*O*&: Envelope sender's domain.
+.next
+&*D*&: Current(?) domain.
+.next
+&*I*&: SMTP client Ip.
+.next
+&*C*&: SMTP client pretty IP.
+.next
+&*T*&: Epoch time (UTC).
+.next
+&*P*&: SMTP client domain name.
+.next
+&*V*&: IP version.
+.next
+&*H*&: EHLO/HELO domain.
+.next
+&*R*&: Receiving domain.
+.endlist
+The capitalized placeholders do proper URL encoding, if you use them
+lowercased, no encoding takes place. A note on using Exim variables: As
+currenty the SPF library is initialized already during the EHLO phase,
+the amount of variables available for expansion is quite limited.
+.wen