Availability Planning for Transport Servers
Within the Exchange organization, it is important to deploy multiple transport servers to provide message path redundancy. Deploying multiple Hub Transports in each Active Directory site automatically provides redundancy and load balancing for message delivery. Deploying multiple Edge Transport servers will also provide incoming and outgoing SMTP redundancy.
Shadow Redundancy
Exchange Server 2010 includes the shadow redundancy feature, which provides redundancy for messages for the entire time they are in transit. This is in addition to the transport dumpster. With one form of shadow redundancy, the message deletion from the transport queue is delayed until the transport server verifies that all of the ...
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