One of the most requested features in Exchange is to
apply a disclaimer message to emails. The new transport architecture makes this an easy thing to do.
Part III: Working with PowerShell in a Production Environment
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Because of this new routing design, every Active Directory site that has a Mailbox server role must also
have a least one Hub Transport server role. It does not mean all Active Directory sites must have a Hub
Transport server role, only sites with Exchange servers in them.
Active Directory Site - Based Routing
The removal of routing and administrative groups in Exchange Server 2007 brings tighter integration
with Active Directory. This change can be a source of frustration in organizations where the Exchange
administrators have little interaction with the Directory administrators. Exchange administrators may
feel that the new routing architecture removes a large part of what they controlled in the past. As this
chapter shows, this is not entirely true. Even with Active Directory ??“ based routing, it is possible to
manipulate mail flow if needed. This chapter shows various solutions that enable these scenarios.
However, most organizations do not require custom routing and Active Directory has established an
effective routing topology for its replication.
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