[exim] Auto Purge of specific mail

Folks,

I've got 60+ domains all running under WHM and CPANEL using Exim to handle the mail.

I'm using SA and SpamBox to have all the tagged spam messages get added to a SPAM folder on the server.

My question is, can someone help me or point the way to some help in getting a process in place that can traverse all these domains and delete any mail in the spam directory that is older then 60 days?

TIA!
-Chris