Email message

message/rfc822

Extensions

.eml .mime .mht .mhtml

Compressible

yes

Status

IANA-registered

A complete email as a body: headers first, then the message, exactly as it travels over SMTP. It is how mail clients type a forwarded message attachment and how .eml files get served. The name is a fossil — RFC 822 has been obsoleted twice over (RFC 5322 is current) but the type keeps its 1982 number. The extension trap: saved web pages in .mht and .mhtml are MIME containers riding this same type, so a message/rfc822 body is not always mail.

.eml is a mail message; .mht and .mhtml are archived web pages that reuse the same MIME envelope.

Defined by RFC 2046 · IANA registration. Registry facts from the IANA media-types registry via mime-db.

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