Messages getting Stuck in Hub Between Exchange 2010 and 2007 451.4.4.0 DNS Failed

Installing Exchange 2010 along side Exchange 2007
Email flow from Exchange 2010 to a mailbox on 2007 fails
In the Queue Viewer Hub Version 8, Delivery:SMTP Relay in Active Directory Site the Last Error listed is 451.4.4.0 DNS Query Failed, The Error was: SMTPSEND.DNS.NonExistentDomain;nonexsistent domain

Guess there is an issue with my DNS but what??

All other email from these servers are OK External and from 2007 to 2010

Best Regards
Grant
Gibo993Asked:
Who is Participating?
 
Schnell SolutionsSystems Infrastructure EngineerCommented:

Make communication tests between Exchange 2007 and Exchange 2010 with telnet using DNS names and IP addresses. For example: If the first server is Exch01 (10.0.0.11) and the second one is Exch02 (10.0.0.12) inside domain test.local try like this:

From Exch01:
telnet Exch02 25
telnet Exch02.test.local 25
telnet 10.0.0.2 25

From Exch02:
telnet Exch01 25
telnet Exch01.test.local 25
telnet 10.0.0.1 25

With this test you will be able to detect any kind of basic communication problem with your name resolution or with the communications (Sometimes there are firewalls or antivirus blocking the communication)

If this work correctly check your Routing Group Connector configurations in order to check that you are using the correct source and target servers for each routing group connector, you can check it with:

Get-RoutingGroupConnector | format-list


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Gibo993Author Commented:
Hi

The communications tests seem to be coming back OK  (ESMTP MAIL service ready etc)

When I try and run the Get-RoutingGroupConnector | FL  it just returns to the next line with no information.

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Gibo993Author Commented:
It is Exchange 2010 and 2007
The 2007 server is a Domain Controller as well
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Gibo993Author Commented:
Applied the roll up 3 for Exchange SP2 and restarted the Exchange 2010 services and it works !!!  Thankyou
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