I'm on the last final steps from migrating from Exchange 2003 to Exchange 2010. All mailboxes are on 2010, I removed the smtp routing group connector from the servers and shutdown Exchange 2003.
Email is flowing fine except for certain internal emails - example, when I do a test smtp from an application or email coming from sql alerts to an IT distribution group, etc. I went into the 2010 Queue viewer and saw alot of emails in the "unreachable domain".
When I click on the "unreachable domain" queue I receive the error (screenshot)
When i click on one of the stuck emails I receive the information\error:
Subject: Test message
Internet Message ID: <53ddf269-8611-463b-bf75-9
From Address: smtptest@barracudanetworks
Size (KB): 1
Message Source Name: SMTP:Relay Connector
Source IP: 10.1.10.30
Date Received: 12/20/2011 10:44:58 AM
Expiration Time: 12/22/2011 10:44:58 AM
Last Error: There is currently no route to the distribution group expansion server
Queue ID: abc-MAIL2010\Unreachable
I have already created a relay connector on the 2010 server with all subnets included.
I noticed on one of the Distribution List properties>Advanced Tab> that the "Set expansion server" was the 2003 server, I just changed it to the 2010 server. Why is this? Shoudlnt they all be on the 2010 server? How can I fix all this? Help!
How can I resolve this?