Mailing List Message #9702
From: Bill Cole <>
Subject: Re: "domain [of sender??] does not exist"
Date: Tue, 20 Nov 2001 21:40:33 -0500
To: SIMS Discussions <>
At 12:41 PM -0500 11/20/01, R. Scott Perry  imposed structure on a stream of electrons, yielding:
This message is coming from, even though SIMS at
my domain ( insists that
doesn't exist. Can SOMEONE explain why?

Because there is no MX record for  It has an A record, but no MX record.  Many mail servers will look up the A record if the MX record doesn't exist, and try using it.  But, the missing MX record is a problem at that domain.

SIMS will accept either an MX or an A record in the Return-Path check.
Bill Cole                        

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