By default the number of agents configured on
the Edge Transport server is more than those configured on the Hub Transport server. Agents are
discussed later in this chapter.
Part II: Working with Server Roles
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Message Categorization
As noted in Chapter 7 , the Categorizer on the Hub Transport server is notified about messages in the
Submission queue and begins message categorization. It resolves Recipients, expands distribution lists,
applies any Recipient restriction configured, and performs routing based on the Recipients. On the Edge
Transport server, however, no Recipient resolution or distribution list expansion occurs. The domain
portion of the message Recipient is used to determine how the message is routed. There are only two
routing options or next hops for each message. Either a message is routed based on DNS resolution of
the Recipient domain or the message is forwarded to a smart host. In addition, content conversion of the
message is bypassed on the Edge Transport server.
Active Directory Application Mode
Active Directory Application Mode (ADAM) is a stand - alone directory service that provides Lightweight
Directory Access Protocol (LDAP) connectivity to a directory database and can be used by directory -
enabled applications. It is stand - alone in the sense that it does not depend on the existence of an Active
Directory domain or forest to provide its service.
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