+;; These entries have been intentionally excluded by the developers.
+;; "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/
+;; "Organization:" ;
+;; "Phone:" ; http://people.dsv.su.se/~jpalme/ietf/mail-headers/
+;; "Reply-By:" ; RFC 2156
+;; "Reply-To:" ; RFC 2822
+;; "Sender:" ;
+;; "User-Agent:" ; Similar to X-Mailer, so display it.
+;; "X-Mailer:" ;
+;; "X-Operator:" ; Similar to X-Mailer, so display it
+
+;; Keep fields alphabetized (set sort-fold-case to t first).
+;; Mention source, if known.