September 2013
Intermediate to advanced
192 pages
6h 8m
English
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.