On Wed, 2010-02-10 at 13:57 +0000, Stephen Usher wrote: > I've written a program, which is run by cron once a minute, which searches > for > messages within all the users' inboxes and then hard-links them into a backup > store elsewhere on the disk. Then, once a day a reaper process runs which > checks > for all files in that store with only one link and have not been accessed for > a > set amount of time (in our case 90 days) and then deletes those files. In > other > words, the messages are kept for 90 days after they have been deleted or > moved > out of the user's inbox.
http://wiki.dovecot.org/Plugins/Lazyexpunge also does pretty much that, although for all mailboxes, not just for INBOX. And it doesn't automatically expire them.
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