Message routing in depth

Message routing in Exchange 2013 is a combination of familiar concepts (such as least-cost routing) from previous versions and brand-new concepts such as delivery groups. The goal of message routing remains to deliver each message to its recipients in as little time as possible, but the means by which Exchange 2013 achieves this goal are somewhat different from previous versions.

Delivery groups

Exchange 2013 has five types of delivery groups:

  • Routable DAG. This type of delivery group type represents an entire DAG. As far as Exchange routing is concerned, delivering a message to any server in the DAG is good enough. Delivery to the delivery group is considered complete when the message arrives at any server in the DAG, at ...

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