Exchange 2007 uses the following types of queues:
Submission Queue: The submission queue is used by the categorizer to temporarily store all messages pending further action by the Transport agents - messages that should be resolved, routed and processed. Each transport server has one submission queue; all messages that enter the transport server go to the submission queue for processing. Messages that are in the submission queue cannot be in any other queues at the same time.
Mailbox Delivery Queue: The mailbox delivery queue holds messages that are being delivered to a mailbox server by using encrypted Exchange RPC. Only Hub Transport servers have mailbox delivery queues. They temporarily store messages that are being routed to the destination mailbox on a remote mailbox server in the same organization as the Hub Transport server.
Remote Delivery Queue: Hub Transport servers and Edge Transport servers can have remote delivery queues; they hold messages temporarily while they are routed to remote destinations using SMTP. These remote destinations can be an external domain, SMTP connector, or a destination which is outside the scope of the Active Directory site in which the Hub Transport server is located.
Poison Message Queue: The poison message queue holds any messages that are considered to be problematic after there has been a server failure. All messages in this queue are suspended and can be deleted manually. Each transport server has one poison message queue.
Unreachable Queue: The unreachable queue holds messages that cannot be routed to the intended destination. Each transport server has one unreachable queue.
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