Variable: message-default-headers
message-default-headers is a customizable variable defined in
message.el.gz.
Value
nil
Documentation
Header lines to be inserted in outgoing messages.
This can be set to a string containing or a function returning header lines to be inserted before you edit the message, so you can edit or delete these lines. If set to a function, it is called and its result is inserted.
This variable was added, or its default value changed, in Emacs 23.2.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/message.el.gz
(defcustom message-default-headers ""
"Header lines to be inserted in outgoing messages.
This can be set to a string containing or a function returning
header lines to be inserted before you edit the message, so you
can edit or delete these lines. If set to a function, it is
called and its result is inserted."
:version "23.2"
:group 'message-headers
:link '(custom-manual "(message)Message Headers")
:type '(choice
(message-header-lines :tag "String")
(function :tag "Function")))