Looks like a DNS issue. Can you do an nslookup of the domain in question?

Regards

Mr Louis Joyce
Computer Support Analyst
Network Administrator
BT Ignite eSolutions




-----Original Message-----
From: roger [mailto:[EMAIL PROTECTED]]
Sent: 20 December 2001 15:33
To: Exchange Discussions
Subject: Cant resolve some mails


Hi

I have a simple domain consisting of One Win2k Domain controller with
Exchage 5.5, all has the latest service packs.

I am finding that certail mails when sent from my users are getting stuck
in the Intertnet mail service\Queeus Tab, when i check the detail they are
as follows :

[451 4.1.8 Domain of sender address ????.com does not resolve.

Cheers

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