Submission can also occur when the store driver retrieves outbound messages from users ??™
outboxes and places them in the Submission queue. (See Figure 7 - 1 .) This queue is essentially an
ESE database similar to the server mailbox store database. This differs markedly from Exchange
Server 2000/2003 where incoming SMTP messages or messages from the pickup queue were
placed in the Queue folder, a physical NTFS partition.
Figure 7-1
Part II: Working with Server Roles
194
As shown in Figure 7 - 1 , when there are no messages sent or delivered by the Hub Transport the
Get-Queue cmdlet returns only the Submission queue. Notice that the DeliveryType is undefined and
NextHopConnector is all zeros. The next hop is the Categorizer. Like any other message queue in
Exchange Server 2007, it can be suspended and resumed. When this is done, the Hub Transport server
no longer processes new incoming messages; rather, the message count continually increases by the
number of new messages received. When the queue is resumed, the Submission queue is de - queued
and messages are picked up once again by the Categorizer. The Suspend-Queue and Resume-Queue
cmdlets are used to pause and resume message queues as shown in Figure 7 - 1 . Notice the change
in queue status when the queue is suspended and when resumed.
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