This variable is a list of mail source specifiers.
See Info node `(gnus)Mail Source Specifiers'."
:group 'mail-source
- :version "23.0" ;; No Gnus
+ :version "23.1" ;; No Gnus
:link '(custom-manual "(gnus)Mail Source Specifiers")
:type `(choice
(const :tag "None" nil)