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Cannot send mail to existing Exchange 2007 mailbox from Exchange 2010

Posted on 2011-02-14
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Last Modified: 2012-05-11
To All,

I've successfully installed Exchange Server 2010, and I've been able to move mailboxes from my existing Exchange 2007 to the new one. However, I'm not able to send e-mails from 2010 to 2007. On 2010, I can send and receive externally through the Internet, and I'm able to receive internally. I just can't send out to 2007. I've read the following thread and tried the solution.

http://www.experts-exchange.com/Microsoft/Hardware/Q_26713062.html

What happens is that the mail gets stuck in the queue and it dies out after 2 days. I've disabled all the receive connectors except for the Default and Client, and it still doesn't work.
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Question by:blkburn
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blkburn earned 0 total points
ID: 34901350
It's solved now. The issue was related to the DNS. I just added the FQDN of the 2007 to the hosts file for the 2010 server.
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