Variable: rmail-show-message-hook
rmail-show-message-hook is a customizable variable defined in
rmail.el.gz.
Value
nil
Documentation
List of functions to call when Rmail displays a message.
Probably introduced at or before Emacs version 18.52.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/rmail.el.gz
;;;###autoload
(defcustom rmail-show-message-hook nil
"List of functions to call when Rmail displays a message."
:type 'hook
:options '(goto-address)
:group 'rmail)