RFC 1893: Enhanced Mail System Status Codes

There currently is not a standard mechanism for the reporting of mail system errors except for the limited set offered by SMTP and the system specific text…

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Outgoing relationships (1 related RFC)

Informative reference — RFC 1894: An Extensible Message Format for Delivery Status Notifications

Incoming relationships (11 related RFCs)

Obsoleted by, Normatively referenced by — RFC 3463: Enhanced Mail System Status Codes
Normatively referenced by — RFC 3801: Voice Profile for Internet Mail - version 2 (VPIMv2)
Informatively referenced by — RFC 2821: Simple Mail Transfer Protocol
Informatively referenced by — RFC 2034: SMTP Service Extension for Returning Enhanced Error Codes
Informatively referenced by — RFC 1894: An Extensible Message Format for Delivery Status Notifications
Informatively referenced by — RFC 1891: SMTP Service Extension for Delivery Status Notifications
Informatively referenced by — RFC 2421: Voice Profile for Internet Mail - version 2
Informatively referenced by — RFC 2476: Message Submission
Informatively referenced by — RFC 2532: Extended Facsimile Using Internet Mail
Informatively referenced by — RFC 5248: A Registry for SMTP Enhanced Mail System Status Codes
Informatively referenced by — RFC 2789: Mail Monitoring MIB