Variable: display-time-mail-directory
display-time-mail-directory is a customizable variable defined in
time.el.gz.
Value
nil
Documentation
Name of mail inbox directory, for indicating existence of new mail.
Any nonempty regular file in the directory is regarded as newly arrived mail. If nil, do not check a directory for arriving mail.
Probably introduced at or before Emacs version 22.1.
Source Code
;; Defined in /usr/src/emacs/lisp/time.el.gz
(defcustom display-time-mail-directory nil
"Name of mail inbox directory, for indicating existence of new mail.
Any nonempty regular file in the directory is regarded as newly arrived mail.
If nil, do not check a directory for arriving mail."
:type '(choice (const :tag "None" nil)
(directory :format "%v")))