(Click on image for enlarged view.) To access recipient policies in ESM, drill down under Recipients to the Recipient Policies container, as shown in Figure 5.28.
Figure 5.28 ESM console showing Recipient Policies container and Default Policy.

You might also encounter outside messaging systems that use Lotus Notes, Group Wise, or some other application with unique addressing.
These require special connectors that fall outside the scope of this book.
Default Recipient Policy You can view the proxy addresses assigned to a recipient using the Active Directory Users and Computers console.
Open the Properties window for the recipient and select the Email Addresses tab. When you install Exchange for the first time, it determines the format of the SMTP address you'll want for your users based on your organization name and the DNS name of your domain.
It places the result into an Active Directory object called a Recipient Policy.
A service called the Recipient Update Service, or RUS, reads the proxy addresses in that default recipient policy and applies them to the mail-enabled objects in Active Directory.
Figure 5.27 Proxy email addresses assigned based on Default Recipient Policy.
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You are reading tip #7 from "15 tips in 15 minutes: Managing recipients and distribution lists," excerpted from Chapter 5 of the book Learning Exchange Server 2003, published by Addison-Wesley Professional.
Because Exchange 2003 uses Simple Mail Transfer Protocol (SMTP) for internal and external mail routing, all email objects in Active Directory get an SMTP proxy address.
Exchange also assigns an X.400 proxy address, just in case you need to route messages to a legacy Exchange system.