Greetings,
We have a Exchange 2007 server that we're migration from, and anExchange 2013 server that we're going to.
Both are in separate AD domains.
So, if you sent an e-mail to someone in company.com it goes through Google spam first,then on to the Exchange 2007 server.
We need the Exchange 2007 server to auto forward any user that doesn't exist on that server,to the Exchange 2013 server, so that once we migrate (move) someone to the newer system, they will still get their mail.
In contrast, we need the same thing to happen with the Exchange 2013 server so that users on that server can still send e-mail back to users on the Exchange 2007 server.
Doing this per mailbox is waayyy too cumbersome for making rules per recipient.
We want the Exchange system to simply send/relay mail for recipients it doesn't possess onto the other Exchange server.
What we don't want, is a loop of endless relaying, where server a sends to server b cause it doesn't have that person, and server b sends it back to server a for the same reason.
Any thoughts would be appreciated.
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