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Some, but not all, email sent from our Exchange Server errors out 5.1.8 domain does not exist

Posted on 2008-11-17
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Last Modified: 2012-05-05
Our Exchange 2003 server delivers most email, but more and more of it is coming back as undeliverable due to "domain does not exist" - I recently worked with AT&T DNS services, and they now have a PTR record setup with our MX. But the problem is getting worse, not better. I am using their lookup servers as forwarders. Did I miss something?
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bevhost earned 1500 total points
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Find more reliable forwarders or try not using forwarders at all.
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