Variable: mail-setup-with-from
mail-setup-with-from is a customizable variable defined in
sendmail.el.gz.
Value
t
Documentation
Non-nil means insert From: field when setting up the message.
This variable was added, or its default value changed, in Emacs 22.1.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/sendmail.el.gz
(defcustom mail-setup-with-from t
"Non-nil means insert `From:' field when setting up the message."
:type 'boolean
:version "22.1")