Exchange 2003 to 2010 Migration

We are attempting to transition from exchange 2003 to exchange 2010 and cannot get mail to flow internally between them. Sending externally works fine. I have created an internal routing group connector, but mail is still stuck in the queue on both ends. On a side note, I also cannot query public folders between the servers.
aandoAsked:
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aandoAuthor Commented:
After running the mail flow troubleshooter I am getting this error:

The 'Remote delivery' queue ("servername"\6) on server "server name" is in retry status. Number of message(s) in the queue: 10. Last error information: 451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain
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aandoAuthor Commented:
This solved the issue with mail going internally from exchange 2010 to 2003.

http://int.social.technet.microsoft.com/Forums/en/exchange2010/thread/09172e5e-d7ba-4bbf-9418-0c37da4187f9

The Internal domain name server settings of the Exchange were wrongly set to an external DNS that didn't include records of the Exchange 2003 server.

i.e. At at OS level the Exhcange 2010 servers could resolve the IP address of the 2003 Exchange server asing the internal DNS settings of their NIC. -testing via nslookup or ping proved this. The Exchange 2010 transport layer was using the DNS setup on the Hub transport server config. this was set to a public DNS that did not hold records for the Exchange 2003 server on the private LAN.

Problem was resolved by setting DNS IP of servers on the INTERNAL LAN that held records for the Exchange 2003 server as follows:

MMC Server Congfiguration\Hub Transport\Server name\Internal DNS Lookups Tab\Use these DNS servers Set correct IPs and click OK

Restart MS Exchange Transport service using services.mmc.
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aandoAuthor Commented:
I still cannot send internally from exchange 2003 to exchange 2010. Any suggestions?
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npinfotechCommented:
From the previous link:

I ran into this issue yesterday...mail flow from 2003 --> 2010 not working. Turns out that if you are using a smarthost you need to remove it from the smtp virtual server in 2003 and create an smtp connector in the First Routing Group that defines the smarthost instead. Otherwise Exchange gets "confused" and doesn't know how to route the mail to mailboxes that reside on the 2010 server. Just wanted to throw that out there for anyone else that my run into this issue.
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ash007Commented:
Please create a bidirectional send connector between Exchange 2003 & exchange 2010 for mail flow
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aandoAuthor Commented:
I found out that our AVG antivirus installed on the Exchange 2003 server was blocking the mail flow from 2003 to 2010. After disabling it, the queue emptied and everything worked perfectly.
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aandoAuthor Commented:
I found the solution.
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