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Outgoing mail to one outside domain is stuck

richard_west asked
Last Modified: 2010-03-06
For the past few days I have been having problems sending email messages to receipants of a single domain. To be clear this is an external internet domain -- not an active directory domain.

My users are receiving NDR Delay messages, and ultimatly NDR messages for these emails. I have looked thourhg the Event Logs and enchange logs but can not figure out what the problem is. From System Manager I can see the messages sitting in the queue.

I am able to use nslookup from the exchange server and return the mail servers that we should be connecting to.

Does anyone have any suggestions on what I can do here?
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