SMTP Service Extension for Authentication
RFC 2554, “SMTP Service Extension for Authentication”, is a Proposed Standard document published in March 1999 by J. Myers. It has been obsoleted by RFC 4954 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
This document defines an SMTP service extension [ESMTP] 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. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 2554 is hosted at rfc-editor.org. Available in TXT,HTML.
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