It is
important to note that this is a one - way replication of information and not all data in Active Directory is
synchronized with the ADAM directory. Only Recipient, configuration, and topology information
required by the Edge server to perform its functions of message relay, message hygiene, anti - spam, and
the application of transport rules are replicated to ADAM. How, then, is this information kept up to
date? The MSExchangeEdgeSync service, which runs only on the Hub Transport server, pushes updates
and changes from Active Directory to ADAM on a scheduled basis.
For communication with Hub Transport servers within the Exchange organization and synchronization
of updates, it is recommended that the Edge Transport server be subscribed to an Active Directory site in
the Exchange Server organization. Edge subscription provides secure replication of information from
Active Directory to ADAM and simplifies the configuration of the Edge Transport server to relay
messages into and out of the Exchange organization. It also simplifies the configuration made on the
Hub Transport servers such that they know to route outbound Internet mail to the Edge Transport server
for Internet delivery. The edge subscription process also enables Recipient lookups and anti - spam
features.
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