+;; Theese entries have been intentionally excluded by the developers.
+;; "X-Operator:" ; Similar to X-Mailer, so display it
+;; "Comments:" ; RFC 2822 - show this one
+;; "Fax:" ; http://people.dsv.su.se/~jpalme/ietf/mail-headers/
+;; "Mail-System-Version:" ; http://people.dsv.su.se/~jpalme/ietf/mail-headers/
+;; "Mailer:" ; http://people.dsv.su.se/~jpalme/ietf/mail-headers/
+;; "Phone:" ; http://people.dsv.su.se/~jpalme/ietf/mail-headers/
+;; "Reply-By:" ; RFC 2156
+;; "Reply-To:" ; RFC 2822
+;; "User-Agent:" ; Similar to X-Mailer, so display it.
+;;