Variable: mail-hist-keep-history
mail-hist-keep-history is a customizable variable defined in
mail-hist.el.gz.
Value
t
Documentation
Non-nil means keep a history for headers and text of outgoing mail.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/mail-hist.el.gz
;;;###autoload
(defcustom mail-hist-keep-history t
"Non-nil means keep a history for headers and text of outgoing mail."
:type 'boolean)