Variable: rmail-speedbar-match-folder-regexp

rmail-speedbar-match-folder-regexp is a customizable variable defined in rmail.el.gz.

Value

"\\`[A-Z0-9]+\\(\\.[A-Z0-9]+\\)?\\'"

Documentation

Regexp matching Rmail folder names to be displayed in Speedbar.

Enabling this permits Speedbar to display your folders for easy browsing, and moving of messages.

Source Code

;; Defined in /usr/src/emacs/lisp/mail/rmail.el.gz
;;; Speedbar support for RMAIL files.
(defcustom rmail-speedbar-match-folder-regexp
  "\\`[A-Z0-9]+\\(\\.[A-Z0-9]+\\)?\\'"
  "Regexp matching Rmail folder names to be displayed in Speedbar.
Enabling this permits Speedbar to display your folders for easy
browsing, and moving of messages."
  :type 'regexp
  :group 'rmail
  :group 'speedbar)