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Date: Thu, 25 Oct 2007 18:19:57 -0400 (EDT)
From: "Steve Bertrand" <iaccounts@ibctech.ca>
To: chriskot@quietwind.net
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Cc: freebsd-questions@freebsd.org
Subject: Re: Sendmail error mesage
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> What does "451 Could not complete sender verify callout" mean ?

I have seen this before when a mail server is trying to send email
from itself but does not listen on port 25.

Do you have an SMTP server running on port 25 that at least the
localhost can reach?

Steve