Queues in Exchange 2013
If you look at the set of queues for an Exchange 2013 server (which you can see with a quick run of the Get-Queue cmdlet), you’ll see that the queues break down into a few well-defined groupings. Each mailbox database has its own destination queue, as does each DAG and Active Directory site. Somewhat surprisingly, Active Directory forests have their own queues, as do external SMTP domains; these two groups could be combined because delivery to a remote forest uses SMTP, but Microsoft evidently sees some advantage in keeping them separate.
When the Transport service processes messages in a queue, it attempts to deliver the first message in the queue; if the message delivery succeeds, it updates the transport high availability ...
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