RFC 9228: Delivered-To Email Header Field

The address to which email is delivered might be different than any of the addresses shown in any of the content header fields that were created by the…

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Outgoing relationships (7 related RFCs)

Normative reference — RFC 2119: Key words for use in RFCs to Indicate Requirement Levels
Normative reference — RFC 8174: Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words
Normative reference — RFC 5234: Augmented BNF for Syntax Specifications: ABNF
Normative reference — RFC 5322: Internet Message Format
Normative reference — RFC 5321: Simple Mail Transfer Protocol
Normative reference — RFC 3864: Registration Procedures for Message Header Fields
Normative reference — RFC 5598: Internet Mail Architecture