With the exception of the Submission
queue, for other message queues, the Retry-Queue cmdlet can be used to retry messages in the queue
after a transient failure.
??‘ Categorizer: The Categorizer collects and processes messages placed in the Submission queue.
This key component of the transport pipeline is responsible for several functions depending on
whether the transport server is the Hub or Edge server role. On the Edge server, categorization
simply involves routing the submitted message to a delivery queue based on the recipient
domain. On the Hub Transport server, categorization involves recipient resolution, distribution
list expansion, message content conversion, routing, and application of any rules defined. Thereafter
message delivery is either MAPI Delivery or Remote Delivery to another Hub server or
Edge Transport server. On the Edge Transport server, unlike the Hub Transport server, after
categorization, message delivery will always be via Send Connectors to the target destination.
Figure 7 - 4 shows the transport pipeline exposing two events of the Categorizer: the
OnSubmittedMessage and OnRoutedMessage events.
??‘ Local (MAPI) Delivery: This stage of the transport pipeline delivers messages from a Hub
Transport server to a mailbox on a mailbox server in the Active Directory site.
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