From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <001901c0edfa$1a744bd0$e8b7c6d4@SOMA>
From: "Boyd Roberts" <boyd@planete.net>
To: <9fans@cse.psu.edu>
References: <20010605195228.15329.qmail@f.bio.cse.psu.edu>
Subject: Re: [9fans] I think that bell labs just broke. But hten maybe its me. 
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Date: Tue,  5 Jun 2001 22:00:00 +0200
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> > <<< 554 Sender domain must exist: cd.chalmers.se!lac
> 
> I think checks of that sort are ill-advised.

i've wondered what heuristic get applied in these cases
(in general).  unlike the rbl these types of checks are
not fail safe.