_procmail_ is nasty. It has a tortuous and complicated recipe format, and I
don't like it. I wanted something flexible whereby I could filter my mail
using Perl tests.

Mail::Audit 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, replied to,
and so on. It's designed to allow you to easily create filter programs to
stick in a _.forward_ file or similar.

Mail::Audit groks MIME; when appropriate, it subclasses MIME::Entity. Read
the MIME::Tools man page for details.