Timo Sirainen wrote:

Expire plugin. Mails are expunged from mailboxes after being there the

configurable time. The first expiration date for each mailbox is stored in

a dictionary so it can be quickly determined which mailboxes contain

expired mails. The actual expunging is done in a nightly cronjob, which

you must set up:

dovecot --exec-mail ext /usr/libexec/dovecot/expire-tool

#expire = Trash 7 Spam 30 #expire_dict = db:/var/lib/dovecot/expire.db

For users implementing the expire-tool as an email retention policy, it may be helpful to add path wildcarding and exclusion to handle users with folder heirarchies.

e.g., To implement a 1-year retention policy on messages in all folders, excluding all messages in and in subfolders of 'Archived Email':

expire = Trash 7 Spam 30 * 365 expire_exclude = Archived\ Email\\*