full-disclosure - DNS Poisoning?

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Message-ID: <3F60E8BC.7000106@comcast.net>
From: Dark-Avenger at comcast.net (Dark Avenger)
Subject: DNS Poisoning?

Does anyone know if Comcast.net has been compromised?

While retrieving email today, I received this error message:

"The DELE command did not succeed. Mail server mail.comcast.net 
responded: ailserver.victim.com ESMTP
Sendmail 8.12.9/8.12.9; Wed, 10 Sep 2003"

And yes, that is "ailserver.victim.com", not "mailserver".

Does this look like DNS poisoning?