2.1.5 Enhancements to Internet email to Support Diverse Service Environments (lemonade)

NOTE: This charter is a snapshot of the 70th IETF Meeting in Vancouver, BC Canada. It may now be out-of-date.
In addition to this official charter maintained by the IETF Secretariat, there is additional information about this working group on the Web at:

       Additional LEMONADE Web Page

Last Modified: 2007-04-19


Glenn Parsons <gparsons@nortel.com>
Eric Burger <eburger@bea.com>

Applications Area Director(s):

Chris Newman <chris.newman@sun.com>
Lisa Dusseault <lisa@osafoundation.org>

Applications Area Advisor:

Chris Newman <chris.newman@sun.com>


Alexey Melnikov <alexey.melnikov@isode.com>

Mailing Lists:

General Discussion: lemonade@ietf.org
To Subscribe: lemonade-request@ietf.org
In Body: in boby 'subscribe'
Archive: http://www.ietf.org/mail-archive/web/lemonade/index.html

Description of Working Group:

Lemonade is tasked to provide a set of enhancements and profiles of
Internet email submission, transport, and retrieval protocols to
facilitate operation on platforms with constrained resources, or
communications links with high latency or limited bandwidth. A primary
goal of this work is to ensure that those profiles and enhancements
continue to interoperate with the existing Internet email protocols in
use on the Internet, so that these environments and more traditional
Internet users have access to a seamless service.

Lemonade's work is at the crossroads of a body of work related to
Internet messaging, in particular work done by the VPIM, FAX, and
IMAPEXT IETF working groups. Given the potentially broad scope of
activities this group could engage in, the group will focus
specifically on the following work items:

0. An informational RFC or RFCs will be produced on LEMONADE
architecture and the issues it seeks to address.

1. Enhance the existing IMAP4 message retrieval and message submission
(RFC 2476) protocols to satisfy the requirements for handling
multimedia content. The existing standards-track CONNEG framework will
be used if content negotiation capabilities are needed. The group will
employ existing protocols (such as for streaming) with IMAP4 instead
duplicating such functionality within IMAP4.
2. Enhance the existing IMAP4 message retrieval and/or message
submission (RFC 2476) protocols to satisfy the requirements for
forwarding a message and/or its attachments without downloading
the message to the client and subsequently uploading the message to a

3. Refine the existing IMAP4 message retrieval protocol to facilitate 
its use with devices that have limited capabilities such as mobile   
endpoints. At most one backwards compatible profile of IMAP4 will be 
produced by this effort.

4. Define a format for message notifications for servers reporting   
message status information to other servers. Specify the method for 
delivery of those notifications.

5. Create a specification describing the use of Internet message     
services in environments where message delivery may take place using 
either Internet protocols or through an MMS server using WAP to
communicate with the receiving user agent.

Any protocols defined by this working group will include appopriate
security mechanisms, including authentication, privacy, and access
control. Mandatory-to-implement security mechanisms will be specified
as needed in order to guarantee secure protocol interoperability.

The transport area will be consulted to deal with any transport-related
issues that arise, especially in regards to items 1-4 above.

The IAB is currently working on the specification of general
and requirements for notification services. Once complete this work
will be used as input to item 4 above.

The working group is aware of several related activities in other

- 3GPP TSG T WG2 SWG3 Messaging <http://www.3gpp.org/TB/T/T2/T2.htm>
- W3C Mulitmodal interaction Activity <http://www.w3.org/2002/mmi/>
- Open Mobile Alliance <http://www.openmobilealliance.org/>
- 3GPP2 TSG-X <http://3gpp2.org/Public_html/X/index.cfm>

The goal is to coordinate efforts with at least these groups as

While there is obvious synergy, given the end-of-life of the VPIM and
FAX work groups and the similar membership, the working group does not
expect to coordinate with these other groups.

Goals and Milestones:

Done  Submit LEMONADE goals and use-cases specification to the IESG
Done  Submit server to server notification requirements to the IESG
Done  Submit translation to other messaging systems to the IESG
Done  Submit IMAP/SUBMIT extensions for forward without download to IESG
Done  Submit IMAP4 profile for mobile devices to the IESG
Done  Submit IMAP COMPRESS Extension to the IESG
Done  Submit Deployment Considerations to the IESG
Done  Submit IMAP WITHIN Search extension to the IESG
Done  Submit SASL-IR IMAP4 extension to the IESG
Feb 2007  Submit contextual mailboxes extension to the IESG
Done  Submit IMAP CONVERT extension to the IESG
Done  Submit Quick Reconnect extension to the IESG
Mar 2007  Submit Update to RFC 2192 (IMAP URL) to the IESG
Mar 2007  Submit Notification Format to the IESG
Apr 2007  Submit Notification Protocol Suite to the IESG
May 2007  Submit IMAP4 extensions for streaming multimedia to the IESG
Jun 2007  Submit Profile bis document to the IESG


  • draft-ietf-lemonade-rfc2192bis-07.txt
  • draft-ietf-lemonade-convert-10.txt
  • draft-ietf-lemonade-imap-sieve-03.txt
  • draft-ietf-lemonade-notifications-04.txt
  • draft-ietf-lemonade-profile-bis-05.txt
  • draft-ietf-lemonade-deployments-09.txt
  • draft-ietf-lemonade-search-within-05.txt
  • draft-ietf-lemonade-compress-08.txt
  • draft-ietf-lemonade-msgevent-04.txt
  • draft-ietf-lemonade-streaming-02.txt
  • draft-ietf-lemonade-reconnect-client-05.txt

    Request For Comments:

    RFC4356 Standard Mapping Between the Multimedia Messaging Service (MMS) and Internet Mail
    RFC4416 I Goals for Internet Messaging to Support Diverse Service Environments
    RFC4467 PS Internet Message Access Protocol (IMAP) - URLAUTH Extension
    RFC4468 PS Message Submission BURL Extension
    RFC4469 PS Internet Message Access Protocol (IMAP) CATENATE Extension
    RFC4550 PS Internet Email to Support Diverse Service Environments (Lemonade) Profile

    Meeting Minutes


    Chairs slides
    NOTIFY, CONVERT, ENABLE, Lemonade interop, Lemonade Profile Bis, etc.