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POP3 Extension Mechanism (RFC2449)

IP.com Disclosure Number: IPCOM000003026D
Original Publication Date: 1998-Nov-01
Included in the Prior Art Database: 2019-Feb-11
Document File: 19 page(s) / 24K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Gellens: AUTHOR [+2]

Related Documents

10.17487/RFC2449: DOI

Abstract

This memo updates RFC 1939 to define a mechanism to announce support for optional commands, extensions, and unconditional server behavior. [STANDARDS-TRACK]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 10% of the total text.

Network Working Group R. Gellens Request for Comments: 2449 Qualcomm Updates: 1939 C. Newman Category: Standards Track Innosoft L. Lundblade Qualcomm November 1998

POP3 Extension Mechanism

Status of this Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1998). All Rights Reserved.

IESG Note

This extension to the POP3 protocol is to be used by a server to express policy descisions taken by the server administrator. It is not an endorsement of implementations of further POP3 extensions generally. It is the general view that the POP3 protocol should stay simple, and for the simple purpose of downloading email from a mail server. If more complicated operations are needed, the IMAP protocol [RFC 2060] should be used. The first paragraph of section 7 should be read very carefully.

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Conventions Used in this Document . . . . . . . . . . . . . 3 3. General Command and Response Grammar . . . . . . . . . . . . 3 4. Parameter and Response Lengths . . . . . . . . . . . . . . 4 5. The CAPA Command . . . . . . . . . . . . . . . . . . . . . . 4 6. Initial Set of Capabilities . . . . . . . . . . . . . . . . 5 6.1. TOP capability . . . . . . . . . . . . . . . . . . . . . 6 6.2. USER capability . . . . . . . . . . . . . . . . . . . . 6 6.3. SASL capability . . . . . . . . . . . . . . . . . . . . 7 6.4. RESP-CODES capability . . . . . . . . . . . . . . . . . 8 6.5. LOGIN-DELAY capability . . . . . . . . . . . . . . . . . 8 6.6. PIPELINING capability . . . . . . . . . . . . . . . . . 9

Gellens, et. al. Standards Track [Page 1]

RFC 2449 POP3 Extension Mechanism November 1998

6.7. EXPIRE capability . . . . . . . . . . . . . . . . . . . 10 6.8. UIDL capability . . . . . . . . . . . . . . . . . . . . 13 6.9. IMPLEMENTATION capability . . . . . . . . . . . . . . . 13 7. Future Extensions to POP3 . . . . . . . . . . . . . . . . . 14 8. Extended POP3 Response Codes . . . . . . . . . . . . . . . . 14 8.1. Initial POP3 response codes . . . . . . . . . . . . . . 15 8.1.1. The LOGIN-DELAY response code . . . . . . . . . . . 15 8.1.2. The IN-USE response code . . . . . . . . . . . . . 16 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . 16 10. Security Considerations . . . . . . . . . . . . . . . . . . 17 11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . 17 12. References . . . . . . . . . . . . . . . . . . . . . . . . 17 13. Authors’ Addresses . . . . . . . . . . . . . . . . . . . . 18 14. Full Copyright Statement . . . . . . . . . . . . . . . . . . 19

1. Introduction

The Post Office Protocol version 3 [POP3] is very widely u...

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