RFC 4141: SMTP and MIME Extensions for Content Conversion

A message originator sometimes sends content in a form the recipient cannot process or would prefer not to process a form of lower quality than is preferred.…

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Outgoing relationships (10 related RFCs)

Normative reference — RFC 4234: Augmented BNF for Syntax Specifications: ABNF
Normative reference — RFC 2821: Simple Mail Transfer Protocol
Normative reference — RFC 3461: Simple Mail Transfer Protocol (SMTP) Service Extension for Delivery Status Notifications (DSNs)
Normative reference — RFC 3464: An Extensible Message Format for Delivery Status Notifications
Normative reference — RFC 3463: Enhanced Mail System Status Codes
Normative reference — RFC 2533: A Syntax for Describing Media Feature Sets
Normative reference — RFC 3282: Content Language Headers
Normative reference — RFC 3297: Content Negotiation for Messaging Services based on Email
Normative reference — RFC 2912: Indicating Media Features for MIME Content
Informative reference — RFC 3238: IAB Architectural and Policy Considerations for Open Pluggable Edge Services

Incoming relationships (2 related RFCs)

Normatively referenced by — RFC 4142: Full-mode Fax Profile for Internet Mail (FFPIM)
Informatively referenced by — RFC 6409: Message Submission for Mail