SMTP Service Extension for Authentication
RFC 4954, “SMTP Service Extension for Authentication”, is a Proposed Standard document published in July 2007 by R. Siemborski, A. Melnikov. It updates RFC 3463. It obsoletes RFC 2554. It has since been updated by RFC 5248. The canonical text is published by the RFC Editor.
Abstract
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]
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 4954 is hosted at rfc-editor.org. Available in TXT,HTML.
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