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The Email Wiki

MIME encoding

Headers & MIME

Content-Type and MIME Structure in Email: Multipart, Encodings and Boundaries (RFC 2045-2049)

Alaa 28 August 2026

Content-Type and MIME structure in email: the RFC 2045-2049 rules for multipart/alternative, multipart/mixed, multipart/related, and their nesting. Covers boundaries, character sets, the four ...

RFCs

RFC 2231: MIME Parameter Value and Encoded Word Extensions

Alaa 16 July 2026

Defines charset and language tagging for MIME parameter values, used in Content-Disposition filenames with non-ASCII characters.