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IP is in DUL

from [Clive]
Subject: IP is in DUL
From: "Clive"
Date: Sat, 28 Jul 2007 13:15:49 +0100
Newsgroups: uk.comp.home-networking 

Hopefully someone can help me.  I am sending emails through Exchange Server 
and am getting some undeliverable messages like one below which states that 
my email has been rejected because my IP is in DUL
;553-mail rejected because your IP is in DUL.
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