Variable: nnmail-expiry-wait
nnmail-expiry-wait is a customizable variable defined in nnmail.el.gz.
Value
7
Documentation
Expirable articles that are older than this will be expired.
This variable can be either a number of days (not necessarily an
integer), or one of the symbols immediate or never, meaning
an article is immediately or never expirable, respectively.
For more granular control, see nnmail-expiry-wait-function.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/nnmail.el.gz
(defcustom nnmail-expiry-wait 7
"Expirable articles that are older than this will be expired.
This variable can be either a number of days (not necessarily an
integer), or one of the symbols `immediate' or `never', meaning
an article is immediately or never expirable, respectively.
For more granular control, see `nnmail-expiry-wait-function'."
:group 'nnmail-expire
:type '(choice (const :tag "Immediate" immediate)
(const :tag "Never" never)
(number :tag "Days")))