Mailing List Message #106887
From: Paul_Dudley <>
Subject: DNS server failure - mail queue issue
Date: Fri, 13 Jul 2018 14:13:17 +1000
To: CommuniGate Pro Discussions <>
X-Mailer: CommuniGate Pro MAPI Connector


We have a number of outbound messages stuck in the sending queue. They were stuck there because of a DNS server failure error, trying to resolve a specific domain. I have since changed the sending SMTP server (under Settings -> Mail -> SMTP -> Sending, and messages sent to that same domain since I made that change are being sent OK.


I would have thought that these stuck messages would now attempt to be sent via the new outgoing SMTP relay server and now be sent, but in the log I still see the same errors:


DNR-009083(xx.xx.xx) MX:DNS server failure

DNR-009125(xx.xx.xx) A:DNS server failure

SMTP-078760(xx.xx.xx) failed to resolve 'xx.xx.xx':Error Code=DNS server failure


I have even fixed the DNS issue on the server itself (it can now resolve the domain correctly) and have re-released the queue but still these messages will not send.

Any ideas? Would stopping and restarting the CommuniGate service fix the problem?






Paul Dudley



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