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2.1 Transport

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The DRS Protocol Extensions for SMTP use SMTP (as specified in [RFC2821]) as a transport.

The endpoint for the DRS Protocol Extensions for SMTP is the mailbox that receives DRS SMTP messages on the target DC. This mailbox is identified by an addr-spec address (as specified in [RFC2822] section 3.4.1) that includes both a local-part and domain. Each DC publishes its preferred mailAddresses (section 2.4.2.1) in the directory. The DRS layer provides to the DRS Protocol Extensions for SMTP the mailAddresses to be used as the SMTP sender and recipient. The particular local-part and domain used in the mailAddress are implementation-specific.<2>

A DC MAY interpret SMTP delivery status notifications (DSNs) for error reporting purposes.<3>