??‘ SMTPRelayWithinAdSiteToEdge: Messages are routed for an external recipient by using
a connector on an Edge Transport server in the local Active Directory site.
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Figure 11 - 1
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??‘ SMTPRelayToRemoteADSite: Messages are routed for delivery to a Hub Transport server
in a remote Active Directory site. The next hop domain is the AD site. Enhanced DNS
resolves the AD site to a list of remote Hub servers.
??‘ SMTPRelayToTiRG: Messages are routed for delivery to an Exchange 2003 Routing
Group Connector. Enhanced DNS is also used to resolve a routing group into a list of
target bridgehead servers.
MAPI Delivery: This delivery is used when the recipient is an Exchange user or system object
and they are located in the same Active Directory site. The message is routed to the mailbox
server for local delivery.
There are two additional types: Undefined and Unreachable. Undefined means the message are in the
Submission queue, and the next hop destination has not been resolved. Unreachable means no route to
the recipient was calculated.
Hub Sites
An example of how a Hub site can be necessary is shown in Figure 11 - 2 . Suppose a user in Site A sends a
message to a user in Site C. The Hub Transport in Site A tries to send the message directly to the Hub Transport
in Site C, but there is a firewall preventing SMTP traffic.
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