After a message
has been categorized and its next hop identified as a mailbox store within the Active Directory
site, the message is moved to the MAPI Delivery queue. The store driver component involved at
this stage connects to the Recipients mailbox store and writes the message to the inbox, after
which the message is deleted from the MAPI Delivery queue. There can be multiple MAPI
Delivery queues depending on the number of mailbox servers in the local site for which
messages are destined. Figure 7 - 2 shows local delivery queues to multiple mailbox servers when
the Get-Queue cmdlet is run.
??‘ SMTP Send/Remote Delivery: After categorization, messages destined for users not in the local
Active Directory site or for remote SMTP servers or domains are placed in the Remote Delivery
queue. This component is controlled by the SMTP Send Connector, which is similar to the SMTP
Connector in Exchange Server 2000/2003. There can be several Remote Delivery queues and you
may see a separate queue for each remote domain that messages are to be delivered to. If an Edge
Transport server exists, remote delivery for all Internet domains will be through the Send Connector
to the Edge Transport server. If coexisting with an earlier version of Exchange, messages destined
for these servers will be relayed to the routing group where these servers reside.
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