Variable: mail-default-directory
mail-default-directory is a customizable variable defined in
sendmail.el.gz.
Value
"~/"
Documentation
Value of default-directory for Mail mode buffers.
This directory is used for auto-save files of Mail mode buffers.
Note that Message mode does not use this variable; it auto-saves
in message-auto-save-directory.
This variable was added, or its default value changed, in Emacs 22.1.
Probably introduced at or before Emacs version 22.1.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/sendmail.el.gz
;;;###autoload
(defcustom mail-default-directory "~/"
"Value of `default-directory' for Mail mode buffers.
This directory is used for auto-save files of Mail mode buffers.
Note that Message mode does not use this variable; it auto-saves
in `message-auto-save-directory'."
:type '(directory :tag "Directory")
:version "22.1")