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Messages Stuck in "Messages with an unreachable destination" Queue

Posted on 2006-11-13
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Last Modified: 2009-09-17
I am working with a mixed Exchange environment of Exchange 2000 and 2003. I have 4 routing groups. Email coming from our branch offices are getting through fine. Email going out to our branch offices (different routing group) are building up on the Messages with an unreachable destination queue. This just started happening. I have tried rebooting the server and restarting the SMTP service. What could be causing this and how do I  correct it?
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Question by:gfcnetwork
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by:Sembee
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Make sure that the main server can resolve and connect to the other servers by all three combinations...

telnet ip.ad.re.ss 25
telnet servername 25
telnet servername.domain.com 25

Any of those fail then you have an idea of where the problem is.

On each server, make sure that the SMTP virtual server is set to the specific IP address not "All Unassigned".

Simon.
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by:gfcnetwork
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All 3 combinations of telnet testing are successful. SMTP virutal server IP address setting is verified that it is set to "All Unassigned."
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by:Sembee
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Change it from all unassigned to the specific IP address.

Simon.
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by:gfcnetwork
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Changed the setting to specific IP address on both exchange server that is showing a backup in the queue and our Bridgehead server that is also showing a backup in the queue. No changes in queue status.
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by:Sembee
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Now that you have made that change, recreate the routing group connectors. That will force the new information to be used.

Furthermore, has the FQDN that is on the SMTP virtual server been changed from the default? If so, does it resolve internally?

Simon.
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by:gfcnetwork
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Routing group connectors have been re-created for Internal routing groups. I did not re-create the connector for Internet Email. Do I delete the old routing group connectors?

How do you tell if the FQDN has been changed on the Virtual Server?
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by:Sembee
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FQDN... ESM, Servers, <your server>, Protocols, SMTP. Right click on the SMTP VS and choose Properties. Click on the tab Delivery and then Advanced. FQDN is in the middle. As this is a multiple server environment it is important that check dns works.

Routing group connectors are held in the domain, and the information on the FQDN tab is used when the connector is created. After recreating the connectors you should delete any old connectors. It can take a few minutes for the change to take, you can restart the Exchange Routing Service to speed things up slightly.

Simon.
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by:gfcnetwork
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The new connectors worked for a bit, but now it is back to messages lining up in the queue. Would this be because of the old connectors?
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Sembee earned 500 total points
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If the old connectors are still in there, then you need to remove them. You shouldn't have two sets of routing group connectors as Exchange will get confused.

Simon.
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by:gfcnetwork
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That seemed to do the trick! Thank you for your help and being quick to reply!
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