Exchange server not routing mail to another Exchange server

When you have two exchange servers and they are not routing mail correctly to one another, check the receive connector – If the other Exchange servers IP fall in the range that is specified in the custom internal relay connector with different permissions. Then the Exchange servers won’t be able to route from one to another.

Also note the following:

After we followed the Exchange deployment kit for 2007 – 2010 migration – We could not send mails from mailboxes that were moved to the new exchange 2010 server – You need to add the new server to the ‘source’ server tab on the new servers send connector.

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