Changes in message submission within a DAG
Transport processing changes slightly within a DAG to achieve better high availability for multirole servers. Normally, the mail submission service will use the closest hub transport server to submit new outgoing messages (and will use the hub transport service running on the local server if this role is active). Within a DAG, the mail submission service will round-robin between hub transport servers within the same Active Directory site and will failback to a local instance if no remote servers are available. In addition, the transport system attempts to route a message via a server other than the one that hosts the mailbox database from where the message originated. These steps are taken to save a copy ...
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