"is inspired by Simon Cozen's Mail::Audit that was inspired by Tom Christiansen's audit_mail and deliverlib programs. It allows a piece of email to be logged, examined, accepted into a mailbox, filtered, resent elsewhere, rejected, and so on. It's designed to allow you to easily create filter programs to stick in a .forward file or similar." Speaking of Simon Cozen, he's written an article for The Perl Journal titled
Filtering Mail with Mail::Audit and News::Gateway, but you'll need a tpj subscription to read it.