many days an article can be stored before it is considered \"old\".
It can also return the values `never' and `immediate'.
-Eg.:
+E.g.:
\(setq nnmail-expiry-wait-function
(lambda (newsgroup)
emptied, and can be used to call any mail box programs you have
running (\"xwatch\", etc.)
-Eg.
+E.g.:
\(add-hook 'nnmail-read-incoming-hook
(lambda ()