RFC 1891
  - 
 SMTP Service Extension
 for Delivery Status Notifications

RFC 1893
  - Enhanced Mail System Status Codes

RFC 1894 
  - An Extensible Message Format for Delivery Status Notifications

RFC 3461
- Simple Mail Transfer Protocol (SMTP) Service Extension 
                for Delivery Status Notifications (DSNs)
Etc.


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Latest update: 2010. 5. 21. 14:38