RFC 3461 (rfc3461) - Page 2 of 38
Simple Mail Transfer Protocol (SMTP) Service Extension for Delivery Status Notifications (DSNs)
Alternative Format: Original Text Document
RFC 3461 SMTP DSN Extension January 2003 4.5 Restrictions on the use of Delivery Status Notification parameters. . . . . . . . . . . . . . . . . . . . . . . . . . 10 5. Conformance requirements . . . . . . . . . . . . . . . . . . . 10 5.1 SMTP protocol interactions. . . . . . . . . . . . . . . . . . 11 5.2 Handling of messages received via SMTP. . . . . . . . . . . . 11 5.2.1 Relay of messages to other conforming SMTP servers. . . . . 12 5.2.2 Relay of messages to non-conforming SMTP servers. . . . . . 13 5.2.3 Local delivery of messages. . . . . . . . . . . . . . . . . 14 5.2.4 Gatewaying a message into a foreign environment . . . . . . 14 5.2.5 Delays in delivery. . . . . . . . . . . . . . . . . . . . . 15 5.2.6 Failure of a conforming MTA to deliver a message. . . . . . 16 5.2.7 Forwarding, aliases, and mailing lists. . . . . . . . . . . 16 5.2.7.1 mailing lists . . . . . . . . . . . . . . . . . . . . . . 17 5.2.7.2 single-recipient aliases. . . . . . . . . . . . . . . . . 18 5.2.7.3 multiple-recipient aliases. . . . . . . . . . . . . . . . 18 5.2.7.4 confidential forwarding addresses . . . . . . . . . . . . 18 5.2.8 DSNs describing delivery to multiple recipients . . . . . . 19 5.3 Handling of messages from other sources . . . . . . . . . . . 19 5.4 Implementation limits . . . . . . . . . . . . . . . . . . . . 19 6. Format of delivery notifications . . . . . . . . . . . . . . . 20 6.1 SMTP Envelope to be used with delivery status notifications . . . . . . . . . . . . . . . . . . . . . . . . 20 6.2 Contents of the DSN . . . . . . . . . . . . . . . . . . . . . 20 6.3 Message/delivery-status fields. . . . . . . . . . . . . . . . 21 7. Acknowledgments. . . . . . . . . . . . . . . . . . . . . . . . 22 8. Security Considerations. . . . . . . . . . . . . . . . . . . . 22 9. Appendix - Type-Name Definitions . . . . . . . . . . . . . . . 24 9.1 "rfc822" address-type . . . . . . . . . . . . . . . . . . . . 24 9.2 "smtp" diagnostic-type. . . . . . . . . . . . . . . . . . . . 24 9.3 "dns" MTA-name-type . . . . . . . . . . . . . . . . . . . . . 25 10. Appendix - Example. . . . . . . . . . . . . . . . . . . . . . 26 10.1 Submission . . . . . . . . . . . . . . . . . . . . . . . . . 27 10.2 Relay to Example.COM . . . . . . . . . . . . . . . . . . . . 28 10.3 Relay to Ivory.EDU . . . . . . . . . . . . . . . . . . . . . 29 10.4 Relay to Bombs.AF.MIL. . . . . . . . . . . . . . . . . . . . 30 10.5 Forward from George@Tax-ME.GOV to Sam@Boondoggle.GOV . . . . 31 10.6 "Delivered" DSN for Bob@Example.COM. . . . . . . . . . . . . 32 10.7 Failed DSN for Carol@Ivory.EDU . . . . . . . . . . . . . . . 33 10.8 Relayed DSN For Dana@Ivory.EDU . . . . . . . . . . . . . . . 34 10.9 Failure notification for Sam@Boondoggle.GOV. . . . . . . . . 35 11. Appendix - Changes since RFC 1891 . . . . . . . . . . . . . . 35 12. References. . . . . . . . . . . . . . . . . . . . . . . . . . 36 12.1 Normative References . . . . . . . . . . . . . . . . . . . . 36 12.2 Informative References . . . . . . . . . . . . . . . . . . . 36 13. Author's Address. . . . . . . . . . . . . . . . . . . . . . . 37 14. Full Copyright Statement. . . . . . . . . . . . . . . . . . . 38 Moore Standards Track
