epa-mail-mode
epa-mail-mode is an interactive autoloaded Lisp function in `epa-mail.el
'.
(epa-mail-mode &optional ARG)
A minor-mode for composing encrypted/clearsigned mails.
With a prefix argument ARG, enable the mode if ARG is positive,
and disable it otherwise. If called from Lisp, enable the mode
if ARG is omitted or nil.