4.5.1 4.4.0 DNS Query Failed

Posted by Justin on Server Fault See other posts from Server Fault or by Justin
Published on 2011-03-01T15:52:37Z Indexed on 2011/03/02 7:26 UTC
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We are running Exchange 2010 and lately I have noticed that some outgoing messages get stuck in the queue with the error "451 4.4.0 DNS Query Failed". On every domain that this happens on I have been able to use nslookup to find the MX record and open a connection to their server over SMTP so I am reasonably sure that this problem is on my end. My send connector isn't routing mail through a smart host nor is is set to use a different DNS server to do the lookup so I'm stumped as to why these messages aren't going out. Any ideas?

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