RFC 6152 Internet Standard Transport

SMTP Service Extension for 8-bit MIME Transport

This memo defines an extension to the SMTP service whereby an SMTP content body consisting of text containing octets outside of the US-ASCII octet range (hex 00-7F) may be relayed using SMTP. [STANDARDS-TRACK]

Status: Internet Standard. The top of the standards track. An old document can hold this label while the document that replaced it holds a lower one, which is the single most misleading thing about RFC status.
Published: March 2011
Authors: J. Klensin, N. Freed, M. Rose, D. Crocker
Read it: rfc-editor.org · DOI

Replaces RFC 1426: SMTP Service Extension for 8bit-MIMEtransport, RFC 1652: SMTP Service Extension for 8bit-MIMEtransport.

Normative requirements

This document does not use the RFC 2119 keywords. It states its requirements in ordinary prose, which is why nothing is listed here rather than because nothing was found.

Every current email RFC