I am using Horde email.   My panel is Plesk.  We are on a dedicated server.

I would like to delete all email from some of the inboxes after they have been there a certain number of hours.  We use these email addresses as a way to post messages to a forum and once they are picked up we don't need them there.  They are supposed to auto delete after being picked up but sometime they hang up and don't delete.

If that's not possible an auto purge of all mail in the inbox at a certain time, say 1am, would also work.

Any suggestions?  Thanks!