efaq: Replying to the sender of a message
11.6 How can I force Rmail to reply to the sender of a message, but not the other recipients?
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Ron Isaacson says: When you hit <r> to reply in Rmail, by default it CCs
all of the original recipients (everyone on the original ‘To’ and ‘CC’
lists). With a prefix argument (i.e., typing ‘C-u’ before <r>), it
replies only to the sender. However, going through the whole ‘C-u’
business every time you want to reply is a pain. This is the best fix
I’ve been able to come up with:
(defun rmail-reply-t ()
"Reply only to the sender of the current message. (See rmail-reply.)"
(interactive)
(rmail-reply t))
(add-hook 'rmail-mode-hook
(lambda ()
(define-key rmail-mode-map "r" 'rmail-reply-t)
(define-key rmail-mode-map "R" 'rmail-reply)))