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Exchange 2010 Mail Queues between 2x Sites

Posted on 2014-02-10
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Last Modified: 2014-02-11
Hi.

I have an exchange 2010 setup within 2 sites. Both sites have 1xEdge, 1xHub/CAS and 1xMail.

I have them setup with DAG so it will failover to site 2 if there is an issue at site 1.

The error I get is that the mailflow is getting stuck at the HUB level. Please see screenshot.
queue
So with the servers off at site 1 (COL) when it fails over to site 2 (BRT) the clients can open outlook fine with the connectors pointing to the correct site hub server but mailflow is either sitting in shadow redundancy or smtp relay queues.

As soon as I turn on the hub server on site 1, with the databases on site 2 everything  works fine.

Any Ideas.

Thanks
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Question by:Colchester_Institute
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Expert Comment

by:Simon Butler (Sembee)
ID: 39847811
Shadow Redundancy is expected - that is basically a queue the email will stay in until the remote server confirms that it has received the messages correctly.

Are the two servers in separate AD sites? Does mail flow between them normally ok?

Simon.
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by:Colchester_Institute
ID: 39849725
Hi Simon thanks for the reply,

The servers are in different sites, but they are part of the same domain. Mail flow works if both the hub servers are on, but as soon as I turn off the site 1 hub it stops.

I have been researching and found that the mailbox in question is a legacy 2003 one. So I think the routing groups might be the culprit.


Is there a way to specify 2x hub servers with the command below as currently there are 2 routing groups and it looks like it is defaulting to the site 1 hub only.

New-RoutingGroupConnector -Name “Exchange RGC” -SourceTransportServers “Ex2010Hub1.contoso.com” -TargetTransportServers “Ex2003BH1.contoso.com” -Cost 10 -Bidirectional $true -PublicFolderReferralsEnabled $true.
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Simon Butler (Sembee) earned 500 total points
ID: 39849745
Routing Groups are only used by Exchange 2003, they aren't used by Exchange 2007 or higher at all. Do you therefore have Exchange 2003 servers in place? That wasn't mentioned in the original question.

You can have as many servers as you like in the RGC, if you have multiple Hub Transport servers, then I would usually configure two or more to be in the RGC so that mail flows as quickly as possible between the two environments.

Simon.
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Author Closing Comment

by:Colchester_Institute
ID: 39849763
many thanks
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