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Mail flow problems with new Exchange 2003 server

After upgrading from Exchange 2003 Standard Edition to Exchange 2003 Enterprise Edition, an administrator is having mail flow issues. SearchExchange.com expert Peter terSteeg offers advice on how to troubleshoot the problem.

We have a Microsoft Exchange 2003 Standard Edition server that we want to move to an Exchange 2003 Enterprise Edition server with more space and resources. We have the new server installed, but mail flow to that server does not work. Any advice would be great.
This is most likely a network or resolution issue between the two servers. I would need more details to provide a specific answer, but you could consider using telnet on port 25 just to confirm you can connect between the two servers.

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