Exchange 2010 -> 2003 mails not sending
Posted on 2011-09-30
Bringing up a new Exchange 2010 server with an existing Exchange 2003 server. Followed Milind Naphade's "Rapid transition guide from Exchange 2003 to Exchange 2010" guide.
I need to keep both servers live for a while as i test out various applications to make sure they are compatible with Exchange 2010. I currently moved one user mailbox over to the 2010 server. I am having issues sending from the 2010 mailbox to a 2003 mailbox.
No problems sending from Exchange 2003 to the 2010 mailbox, 2003 to an external address or 2010 to an external address.
Routing Group connectors are configured....
2010-2003 Exchange routing group () First Routing Group
2010-2003 First Routing Group Exchange routing group ()
Hub Transport settings....
Internal FQDN Authoritative Default=False
External domain name Authoritative Default=True
E-Mail Address Policies
Default Policy Lowest Priority Last Modified=Install Date Applied=False
Smart Host Enabled
Address space SMTP Address=* Cost=1
All test messages from 2010 to 2003 are still sitting in the queue. It also looks like there are some public folder messages as well.
I ran the Message Tracking and see the following error....
Delivery Report for 2003mailbox(email@example.com)¿
9/30/2011 9:23 AM Exchange2010
The message was submitted to exchange2010.
9/30/2011 9:23 AM exchange2010
The message has been queued on server 'exchange2010' since 9/30/2011 9:23:40 AM (UTC-06:00) Central Time (US & Canada). The last attempt to send the message was at 9/30/2011 9:39:37 AM (UTC-06:00) Central Time (US & Canada) and generated the error '451 4.4.0 Primary target IP address responded with: "421 4.4.2 Connection dropped due to SocketError." Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts.'.