Cited in: RFC 2034

4 RFCs mentioned in the text of RFC 2034 (SMTP Service Extension for Returning Enhanced Error Codes)

RFC	Title	Status	Date
821	Simple Mail Transfer ProtocolJ. Postel · obsoleted by RFC 2821	Internet Standard	August 1982
1869	SMTP Service ExtensionsJ. Klensin, N. Freed, M. Rose, E. Stefferud, D. Crocker · obsoleted by RFC 2821	Internet Standard	November 1995
1893	Enhanced Mail System Status CodesG. Vaudreuil · obsoleted by RFC 3463	Proposed Standard	January 1996
1894	An Extensible Message Format for Delivery Status NotificationsK. Moore, G. Vaudreuil · obsoleted by RFC 3464	Proposed Standard	January 1996