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Managing the Store & DAG: EXCERPT from Microsoft® Exchange Server 2013 Inside Out by Tony Redmond

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Changes in message submission within a DAG

Transport processing changes slightly within a DAG to achieve better high availability for message transport. Normally, the Mailbox Transport Submission service submits new outgoing messages to the Transport Service running on the same server. Within a DAG, the Mailbox Transport Submission service round-robins among the other DAG member servers and will failback to a local instance if no remote servers are available. In addition, the transport system attempts to route inbound messages by a server other than the one that hosts the active mailbox database.

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