RFC 3206 · PROPOSED STANDARD · 2002
MON · 14 SEP 2026
The SYS and AUTH POP Response Codes
Overview
RFC 3206, “The SYS and AUTH POP Response Codes”, is a Proposed Standard document published in February 2002 by R. Gellens. The canonical text is published by the RFC Editor.
Abstract
This memo proposes two response codes: SYS and AUTH, which enable clients to unambiguously determine an optimal response to an authentication failure. In addition, a new capability (AUTH-RESP-CODE) is defined. [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.
Read this RFC
The canonical text of RFC 3206 is hosted at rfc-editor.org. Available in TXT,HTML.
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