RFC 2449 · PROPOSED STANDARD · 1998
MON · 27 JUL 2026
POP3 Extension Mechanism
Overview
RFC 2449, “POP3 Extension Mechanism”, is a Proposed Standard document published in November 1998 by R. Gellens, C. Newman, L. Lundblade. It updates RFC 1939. It has since been updated by RFC 5034. The canonical text is published by the RFC Editor.
Abstract
This memo updates RFC 1939 to define a mechanism to announce support for optional commands, extensions, and unconditional server behavior. [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 2449 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1998
- RFC 2448 AT&T's Error Resilient Video Transmission Technique
- RFC 2450 Proposed TLA and NLA Assignment Rule
- RFC 2447 iCalendar Message-Based Interoperability Protocol
- RFC 2451 The ESP CBC-Mode Cipher Algorithms
- RFC 2446 iCalendar Transport-Independent Interoperability Protocol Scheduling Events, BusyTime, To-dos and Journal Entries
- RFC 2452 IP Version 6 Management Information Base for the Transmission Control Protocol
- RFC 2445 Internet Calendaring and Scheduling Core Object Specification
- RFC 2453 RIP Version 2