Variable: message-courtesy-message
message-courtesy-message is a customizable variable defined in
message.el.gz.
Value
"The following message is a courtesy copy of an article\nthat has been posted to %s as well.\n\n"
Documentation
This is inserted at the start of a mailed copy of a posted message.
If the string contains the format spec "%s", the Newsgroups the article has been posted to will be inserted there. If this variable is nil, no such courtesy message will be added.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/message.el.gz
(defcustom message-courtesy-message
"The following message is a courtesy copy of an article\nthat has been posted to %s as well.\n\n"
"This is inserted at the start of a mailed copy of a posted message.
If the string contains the format spec \"%s\", the Newsgroups
the article has been posted to will be inserted there.
If this variable is nil, no such courtesy message will be added."
:group 'message-sending
:type '(radio string (const nil)))