I set:
(setq mail-default-reply-to "u...@example.org") It insert "Reply-To: u...@example.org" header when I do M-x mail RET but it dont work when I hit "m" key in gnus *Group* buffer, or when I hit "r" or "f" to reply or follow an article in summary buffer, because it use message stuff how can I set it in message mode?
