[CentOS] Expunge Old Email

For those of you running mailservers on CentOS 6, what are the 
suggestions for programs to expunge old email? For instance, deleting 
email from a Spam folder that is 2 weeks old or older.

I see that Dovecot does have a solution, but was wondering about what 
others have landed on.

My systems are basically Postfix, Dovecot using Maildir.

Thanks,
John Hinton