From owner-freebsd-questions@FreeBSD.ORG  Thu Apr 15 10:44:06 2004
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Date: Thu, 15 Apr 2004 12:44:05 -0500
From: Martin McCormick <martin@dc.cis.okstate.edu>
Subject: Re: Setting Sendmail to Refuse Possibly Forged Headers 
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	Many thanks.  I should probably buy a Sendmail book, but it
hardly ever needs any attention.  It just quietly works.

Martin

Dan Nelson writes:
>Take a look at the milter-sender port, which checks the sender's email
>address and verifies that an smtp server is listening.