SMTP Service Extension for Authentication
RFC 4954

Changed author "A. Melnikov": changed name from "Alexey Melnikov" to "A. Melnikov", changed is_editor from "False" to "True", cleared country (was "Hampton, Middlesex, TW12 2BX, UK"), changed order from "1" to "2"

Changed author "R. Siemborski": changed name from "Rob Siemborski" to "R. Siemborski", changed is_editor from "False" to "True", cleared country (was "Mountain View, CA 94043, USA"), changed order from "0" to "1"

Received changes through RFC Editor sync (changed abstract to 'This document defines a Simple Mail Transport Protocol (SMTP) extension whereby an SMTP client may indicate an authentication mechanism to the server, perform an authentication protocol exchange, and optionally negotiate a security layer for subsequent protocol interactions during this session. This extension includes a profile of the Simple Authentication and Security Layer (SASL) for SMTP.

This document obsoletes RFC 2554. [STANDARDS-TRACK]')