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This document defines a profile of the Simple Authentication and Security Layer (SASL) for the Post Office Protocol (POP3). This extension allows a POP3 client to 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.
In order to consolidate all of the authentication related information for POP3 into a single document, this document obsoletes RFC 1734 and RFC 3206, replacing them as a Proposed Standard. It also updates information contained in Section 6.3 and Section 8 of RFC 2449.
http://www.ietf.org/internet-drafts/draft-siemborski-rfc1734bis-02.txt