XCON: How Exchange Server 5.5 Routes Custom Recipient Messages Internally (262116)

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When you send an e-mail message to a custom recipient address, the directory places the default address in the custom recipient address X.400 proxy address as a domain-defined attribute (DDA).

For example, if a custom recipient that has a default Simple Mail Transfer Protocol (SMTP) address of "someone@microsoft.com" has the following X.400 proxy address when you send an e-mail message to that custom recipient that has a default SMTP address of someone@microsoft.com, the message is routed as follows, and is routed by DDA first: If the message transfer agent (MTA) cannot find a route, the MTA routes on the X.400 address. In some cases the custom recipient address is routed to an X.400 connector with a "C=*" address space.

Typically, the message loops when the message is rerouted back to the originating site.