Because you can use the Internet Mail Service (IMS) as a connector between Exchange sites, the IMS contains mechanisms for encoding addressing information to let Exchange route non-SMTP traffic through the IMS. For example, consider a configuration of three Exchange sites and one Microsoft Mail (MS Mail) post office:
Site1 ** Site2 ** Site3 ** MS Mail
If you use the IMS as the connector between sites, Exchange uses an addressing scheme similar to IMCEAMS-org/postoffice/account@site3.com to send a message from a user in Site 1 to the connected MS Mail users. This scheme lets the IMS encapsulate the MS Mail address (org/postoffice/account) in a Site 3-type SMTP address; that is, the outer address directs the mail to the site where the MS Mail post office connects and where the inner address is used to determine the ultimate destination. The IMCEAMS prefix lets the system know that this address is an Internet Mail Connector Encapsulated Address (IMCEA) of type MS Mail (MS). A similar addressing scheme that uses the IMCEASMTP prefix lets Exchange encapsulate one SMTP address inside another for the IMS to deliver to a connected system. . . .
Register
