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Go to <a href="http://www.dnsstuff" rel="ugc">www.dnsstuff</a>&nbsp;and troubleshoot that domain. &nbsp;
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Go to www.dnsstuff [http://www.dnsstuff] and troubleshoot that domain.  

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what could be the problem if my exchange server unable to send message to one particular domain. Every place else it can send without any problem. <br />
<br />
here is what my users are getting message when the try to send email to that domain.<br />
<br />
**************************<wbr />**********<wbr />**********<wbr />**********<wbr />**********<wbr />***<br />
This is a delivery status notification, automatically generated by MTA problemdomain.com on Tue, 1 Nov 2003 10:12:42 -0600 (EST)<br />
Regarding recipient(s) : useratproblemdomain@proble<wbr />mdomain.co<wbr />m<br />
Delivery status : Failed. Did not receive the expected protocol response.<br />
(mydomain.com).<br />
We have been attempting delivery for 5 times. &nbsp;Maximum delivery tries attempted. Please contact your administrator to contact the destination domain or resend your message. Delivery failed.<br />
Message Information: <br />
Sender &nbsp; &nbsp; : useratproblemdomain@proble<wbr />mdomain.co<wbr />m <br />
Recipient &nbsp;: myuser@mydomain.com<br />
MTA Response :4.4.1<br />
The original message headers are included as attachment.<br />

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what could be the problem if my exchange server unable to send message to one particular domain. Every place else it can send without any problem. 

here is what my users are getting message when the try to send email to that domain.

*********************************************************************
This is a delivery status notification, automatically generated by MTA problemdomain.com on Tue, 1 Nov 2003 10:12:42 -0600 (EST)
Regarding recipient(s) : useratproblemdomain@problemdomain.com
Delivery status : Failed. Did not receive the expected protocol response.
(mydomain.com).
We have been attempting delivery for 5 times.  Maximum delivery tries attempted. Please contact your administrator to contact the destination domain or resend your message. Delivery failed.
Message Information: 
Sender     : useratproblemdomain@problemdomain.com 
Recipient  : myuser@mydomain.com
MTA Response :4.4.1
The original message headers are included as attachment.


Exchange unable to send email to one particular domain

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.