Replication issues between Exchange 2003 and Exchange 2007

I am trying to migrate a single Exchange 2003 server to Exchange 2007.  Exchange 2007 is installed on windows 2008 x64.  

I can send messages from exchange 2007 mailboxes however I can not receive any messages from the exchange 2003 server.   The Exchange 2003 routing group connector queue shows all the messages.  I have tired to delete and recreate the routing group connector.  

Public folder replication is also not working.

ltrcneAsked:
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MesthaCommented:
That usually means something is interfering with the traffic.
It can also mean a smart host set on the SMTP virtual server.

Ensure the servers can see each other and telnet to port 25 on IP address, NETBIOS name and FQDN.
Verify that you haven't set the FQDN on the SMTP virtual server the same FQDN on the Connectors on the Exchange 2007 server.

If you can see the messages in the queues, what does the error message say?

Simon.
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ltrcneAuthor Commented:
I just verified I can telnet to port 25 to all names in both directions.

I checked the FQDN names and they were different however the SMTP virtural server only had domain.com so I changed it to servername.domain.com.  Is this correct?

I do not see any error messages in the queue.  Messages sent from a 2003 mailbox to a 2007 mailbox only show as "queued" and eventually time out.
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MesthaCommented:
When you click on the queue there should be a message displayed at the bottom of the queue viewer.
Changing the FQDN wasn't really a problem, as long as they didn't clash.

Simon.
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ltrcneAuthor Commented:
The error message shows "The connection was dropped by the remote host"
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MesthaCommented:
Have you checked that there isn't a smart host configured on the SMTP virtual server as I had stated in an earlier post?

Simon.
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ltrcneAuthor Commented:
Ok, I do see now that I have the smart host configured to send via our outside anti-spam/virus providor.  By removing the smart host setting mail flows correctly between the two servers.  

Our SaaS provider indicates we should modify the MTA routing to allow outbound messages to be filtered by their servers.   Should this entry be made somewhere other than the smart host?

Thank you for your help.
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ltrcneAuthor Commented:
I got it now.  The correct settings are already in the SMTP connector and by removing the settings from the SMTP Virtual Server smart host mail flow is working correctly.

Thanks again.
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