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See the image below. I've obscured the @names, but the both mailbox servers would be on the same domain, so DAG should be possible.

Basically, is the below setup possible?

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up vote 1 down vote accepted

I don't see why not. The only issue I can see is that your 1.5MBps link is a bit on the slow side, so whenever one side goes down (e.g. for maintenance) then client access for users who have their main mailbox on that side will be slow.

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