I recently added an exchange 2013 server to an existing 2007 installation with the latest Service Packs and Update rollups. I was able to migrate a test mailbox to the Exchange 2013 server but now I can't receive emails from either external or internal
users to the mailbox located on the Exchange 2013 box. The queue on the Exchange 2007 server shows the emails with a 400.4.4.7 error and ultimately they timeout. Any suggestions for troubleshooting and resolving the issue would be appreciated.
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