Internet Email to Support Diverse Service Environments (Lemonade) Profile
RFC 4550
| Document | Type |
RFC - Proposed Standard
(June 2006; Errata)
Obsoleted by RFC 5550
|
|
|---|---|---|---|
| Last updated | 2018-12-20 | ||
| Stream | IETF | ||
| Formats | plain text pdf htmlized with errata bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 4550 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Ted Hardie | ||
| Send notices to | (None) | ||
Network Working Group S. Maes
Request for Comments: 4550 Oracle
Category: Standards Track A. Melnikov
Isode Ltd.
June 2006
Internet Email to Support Diverse Service Environments
(Lemonade) Profile
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 (2006).
Abstract
This document describes a profile (a set of required extensions,
restrictions, and usage modes) of the IMAP and mail submission
protocols. This profile allows clients (especially those that are
constrained in memory, bandwidth, processing power, or other areas)
to efficiently use IMAP and Submission to access and submit mail.
This includes the ability to forward received mail without needing to
download and upload the mail, to optimize submission, and to
efficiently resynchronize in case of loss of connectivity with the
server.
The Internet Email to Support Diverse Service Environments (Lemonade)
profile relies upon extensions to IMAP and Mail Submission protocols;
specifically, the URLAUTH and CATENATE IMAP protocol (RFC 3501)
extensions and the BURL extension to the SUBMIT protocol (RFC 4409).
Maes & Melnikov Standards Track [Page 1]
RFC 4550 Lemonade Profile June 2006
Table of Contents
1. Introduction ....................................................3
1.1. Conventions Used in This Document ..........................3
2. Forward without Download ........................................3
2.1. Motivations ................................................3
2.2. Message Sending Overview ...................................4
2.3. Traditional Strategy .......................................4
2.4. Step-by-Step Description ...................................5
2.4.1. Message Assembly Using IMAP CATENATE Extension ......6
2.4.2. Message Assembly Using SMTP CHUNKING and
BURL Extensions ....................................10
2.5. Normative Statements Related to Forward without Download ..14
2.6. Security Considerations for "pawn-tickets" ................14
2.7. The fcc Problem ...........................................15
2.8. Registration of $Forwarded IMAP Keyword ...................15
3. Message Submission .............................................15
3.1. Pipelining ................................................16
3.2. DSN Support ...............................................16
3.3. Message Size Declaration ..................................16
3.4. Enhanced Status Code Support ..............................16
3.5. TLS .......................................................16
4. Quick Resynchronization ........................................16
5. Additional IMAP Extensions .....................................17
6. Summary of the Required IMAP and SMTP Extensions ...............17
7. Future work ....................................................18
8. Security Considerations ........................................18
8.1. Confidentiality Protection of Submitted Messages ..........19
8.2. TLS .......................................................19
9. References .....................................................20
9.1. Normative References ......................................20
9.2. Informative References ....................................21
10. Acknowledgements ..............................................21
Maes & Melnikov Standards Track [Page 2]
RFC 4550 Lemonade Profile June 2006
1. Introduction
Lemonade provides enhancements to Internet email to support diverse
service environments.
This document describes the Lemonade profile, which includes:
- "forward without download", which describes exchanges between
Lemonade clients and servers to allow new email messages to be
submitted incorporating content that resides on locations
external to the client.
- Quick mailbox resynchronization using [CONDSTORE].
- Several IMAP and SMTP extensions that save bandwidth and/or
number of round-trips required to send/receive data.
The organization of this document is as follows. Section 2 describes
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