From owner-freebsd-ipfw@FreeBSD.ORG  Fri Aug  6 22:32:03 2004
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Date: Fri, 06 Aug 2004 18:31:51 -0400
From: Forrest Aldrich <forrie@forrie.com>
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Subject: Blocking SMTP traffic based upon RBL....
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There are probably dangerous consequences to doing something like this
improperly; however, there is a project out there called PacketBL:

http://wiki.duskglow.com/index.php/Packetbl

It's for Linux only, unfortunately -- however I like the idea.   It
interfaces with the packet filtering system and selectively blocks SMTP
(port 25, configurable) traffic based upon RBLs etc.

I wonder if there is a similar way to accomplish this with FreeBSD/ipfw...