RFC 9078: Reaction: Indicating Summary Reaction to a Message

The popularity of social media has led to user comfort with easily signaling basic reactions to an author's posting, such as with a 'thumbs up' or 'smiley'…

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Outgoing relationships (6 related RFCs)

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 2045: Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies
Normative reference — RFC 5322: Internet Message Format
Normative reference — RFC 5598: Internet Mail Architecture
Normative reference — RFC 2183: Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field