Variable: message-deletable-headers
message-deletable-headers is a customizable variable defined in
message.el.gz.
Value
(Message-ID Date Lines)
Documentation
Headers to delete if present and previously generated by message.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/message.el.gz
(defcustom message-deletable-headers '(Message-ID Date Lines)
"Headers to delete if present and previously generated by message."
:group 'message-headers
:link '(custom-manual "(message)Message Headers")
:type '(repeat (symbol :tag "Header")))