Variable: mail-default-reply-to
mail-default-reply-to is a customizable variable defined in
sendmail.el.gz.
Value
nil
Documentation
Address to insert as default Reply-To field of outgoing messages.
If nil, it will be initialized from the REPLYTO environment variable
when you first send mail.
If you are using message-mode to compose messages, customize the
variable message-default-mail-headers instead.
Probably introduced at or before Emacs version 18.45.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/sendmail.el.gz
;;;###autoload
(defcustom mail-default-reply-to nil
"Address to insert as default Reply-To field of outgoing messages.
If nil, it will be initialized from the REPLYTO environment variable
when you first send mail.
If you are using `message-mode' to compose messages, customize the
variable `message-default-mail-headers' instead."
:type '(choice (const nil) string))