5.3.0 NDR for only 1 domain.



Good Day we get the following NDR when we try and send mail to a particular
domain:

The following recipient(s) could not be reached:

email@xxxxxxxxxx on 5/4/2005 1:45 PM
The message cannot be delivered due to a configuration error on
the server. Please contact your Administrator.
< #5.3.0 smtp;553 5.3.0 <ddddsss@xxxxxxxxxxxxx>... Addressee
unknown, relay=[x.x.x.x]>

And the following event in the event log:

A non-delivery report with a status code of 5.3.0 was generated for
recipient rfc822;email@xxxxxxxxxx (Message-ID
<B988AE23BD408B4398D9B092BC1200350E8D67@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>).

Causes: Exchange mistakenly attempted mail delivery to an incorrect MTA
route.
For more information, click http://www.microsoft.com/contentredirect.asp.
Solution: Check your route and topology; use the winroute tool to ensure the
routes are properly replicated between servers and routing groups.

Mail flow otherwise is working fine only this domain is causing these NDRs.

What could the problem be?

.



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