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Messages awaiting directory lookup – Queue Build up on Exchange
We had an Exchange 2003 server that had a queue build up. The messages were building up in the “Messages awaiting directory lookup” queue. After investigation we found that the server had old DNS entries which were removed and new entries were added. The queue cleared almost immediately. If you see build up in the Messages awaiting directory lookup queue then be sure to check DNS is working as expected.
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OoO not working because AutoDiscover does not work
1 First: Always check Certificates and DNS 1.1 Check if your certificates are configured correctly and if they have expired. Open the Exchange Management Console and run: Get-ExchangeCertificate | fl Review your certificates and ensure that they have not expired 1.2 Check DNS A good way to test DNS is using NSLOOKUP. Open cmd and type nslookup and hit enter. (In our case we need to run nslookup to our client’s autodiscover address to test redirection as we user autodiscover redirect.) Type autodiscover.yourdomain.com (or .net etc.) this should return with the redirect address as per below screenshot. …
