[lemonade] Re: Lemonade Profile Comments

Here are my comments.  See lines starting with ">>>".

                           <Lemonade Profile>             February 2005

Lemonade
Internet Draft: Lemonade Profile                             S. H. Maes
Document: draft-ietf-lemonade-profile-01.txt                A. Melnikov
Expires: August 2005                                      February 2005

                              Lemonade Profile

Status of this Memo

    This document is an Internet-Draft and is subject to all provisions
    of Section 10 of RFC2026. By submitting this Internet-Draft, each
    author represents that any applicable patent or other IPR claims of
    which he or she is aware have been or will be disclosed, and any of
    which he or she become aware will be disclosed, in accordance with
    RFC 3668.

    Internet-Drafts are working documents of the Internet Engineering
    Task Force (IETF), its areas, and its working groups.  Note that
    other groups may also distribute working documents as Internet-
    Drafts.

    Internet-Drafts are draft documents valid for a maximum of six months
    and may be updated, replaced, or obsoleted by other documents at any
    time.  It is inappropriate to use Internet-Drafts as reference
    material or to cite them other than as "work in progress."

    The list of current Internet-Drafts can be accessed at
         http://www.ietf.org/ietf/1id-abstracts.txt

    The list of Internet-Draft Shadow Directories can be accessed at
         http://www.ietf.org/shadow.html.

Abstract

    This document describes the Lemonade profile to allow clients to
    submit new email messages incorporating content which resides on
    locations external to the client ("forward without download").
>>>  ...describes a profile (a set of required extensions, restrictions,
>>>  and usage modes) of mail protocols such as IMAP and Submission.
>>>  This profile allows clients (especially those that are constrained
>>>  in memory, bandwidth, processing power, or other areas) to
>>>  effeciently 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 have media attached to a
>>>  message converted if required, and to more efficiently maintain
>>>  a synchronized cache of received messages.

    The Lemonade profile relies upon extensions to other protocols;
>>>                                                ^^^^^ -> "various"
    specifically URLAUTH, CATENATE, Lemonade Command Extensions in the
    IMAP protocol [RFC 3501] and BURL in the SUBMIT protocol [RFC 2476].

    In addition, the Lemonade profile contains Lemonade Command
    extensions for quick reconnect and media conversion.
>>>  No, these must not be in a profile document, they must be in
>>>  their own documents and referenced here.

Conventions used in this document

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    In examples, "M:", "I:" and "S:" indicate lines sent by the client
    messaging user agent, IMAP e-mail server and submit server
    respectively.

    The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
    "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
    document are to be interpreted as described in [RFC2119].

Table of Contents

    Status of this Memo...............................................1
    Abstract..........................................................1
    Conventions used in this document.................................1
    Table of Contents.................................................2
    1. Introduction...................................................2
    2. Forward without download.......................................3
       2.1. Motivations...............................................3
       2.2. Message Sending Overview..................................3
       2.3. Traditional Strategy......................................4
       2.4. Step by step description..................................4
       2.5. Additional Considerations.................................8
       2.6. The fcc problem...........................................8
    3. Media Conversion...............................................9
       3.1. Introduction..............................................9
       3.2. Static media conversion...................................9
       3.3. Conversion of streamed media..............................9
       3.4. Quick Reconnect scheme....................................9
    4. Future work...................................................10
    Security Considerations..........................................10
    References.......................................................10
    Version History..................................................12
    Acknowledgments..................................................12
    Authors Addresses................................................12
    Intellectual Property Statement..................................12
    Full Copyright Statement.........................................13

1.
    Introduction

    Lemonade provides enhancements to Internet email to support diverse
    service environments.

    This document describes the lemonade profile that includes:
       - The Lemonade Pull Model that describes exchanges between
         Lemonade Agents to allow clients to submit new email messages
         incorporating content which resides on locations external to
         the client and allow forward without download.
       - Media conversion

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       - Quick reconnect

    The organization of this document is as follows.  Section 2 describes
    the Lemonade Pull Model. Section 3 Section 3 describes the Media
    Conversion. Section 4 describes quick reconnect

2.
   Forward without download

2.1.
     Motivations

    The advent of client/server email using the [RFC3501] and [RFC2821]
    protocols has changed what formerly were local disk operations to
    become excessive and repetitive network data transmissions. This is
>>>        ^^^^^^^^^^^^^^^^^^^^^^^^ <<delete>>
    an onerous burden for clients operating over low-bandwidth and/or
>>>  ^^^^^^^^^ <<delete>>
    high-latency links.

    The Lemonade Pull Model makes use of the [BURL] SUBMIT extension to
    enable access to external sources during the submission of a message.
    In combination with the IMAP [URLAUTH] extension, inclusion of
    message parts or even entire messages from the IMAP mail store is
    possible with a minimal trust relationship between the IMAP and
    SUBMIT servers.

    Pull has the distinct advantage of maintaining one submission
>>>^^^^ -> "This approach"
>>>              ^^^^^^^^ <<<delete 'distinct'>>>
    protocol, and thus avoids the risk of having multiple parallel and
    possible divergent mechanisms for submission.  Furthermore, by
    keeping the details of message submission in the SUBMIT server, the
    Lemonade Pull Model can work with other message retrieval protocols
    such as POP, NNTP, or whatever else may be designed in the future.

2.2.
     Message Sending Overview

    The act of sending an email message is best thought of as involving
    multiple steps: initiation of a new draft, draft editing, message
    assembly, and message submission.

    Initiation of a new draft and draft editing takes place on the MUA.
    Frequently, users choose to save more complex and/or time-consuming
>>>                                                      ^^^^^^^^^^^^^^
>>>  (What is a "time-consuming message"?)
    messages on an [RFC3501] server (via the APPEND command with the
    \Draft flag) for later recall by the MUA and resumption of the
    editing process.

    Message assembly is the process of producing a complete message from
    the final revision of the draft and external sources.  At assembly
    time, external data is retrieved and inserted in the message.

    Message submission is the process of inserting the assembled message
    into the [RFC2821] infrastructure, typically using the [RFC2476]
    protocol.

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2.3.
     Traditional Strategy

    Traditionally, messages are initiated, edited, and assembled entirely
    within an MUA, although drafts may be saved to an [RFC3501] server
    and later retrieved from the server.  The completed text is then
    transmitted to an MSA for delivery.

    There is often no clear boundary between the editing and assembly
    process.  If a message is forwarded, its content is often retrieved
    immediately and inserted into the message text.  Similarly, once
    external content is inserted or attached, the content is usually
    retrieved immediately and made part of the draft.

    As a consequence, each save of a draft and subsequent retrieve of the
    draft transmits that entire (possibly large) content, as does message
    submission.

    In the past, this was not much of a problem, because drafts, external
    data, and the message submission mechanism were typically located on
    the same system as the MUA.  The most common problem was running out
    of disk quota.

2.4.
     Step by step description

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    The model distinguishes between a Messaging User Agent (MUA), an
    IMAPv4Rev1 Server ([RFC3501]) and a submit server ([RFC2476]), as
    illustrated in Figure 1.

         +--------------------+               +--------------+
         |                    | <------------ |              |
         |     MUA (M)        |               | IMAPv4 Rev1  |
         |                    |               |  Server      |
         |                    | ------------> | (Server I)   |
         +--------------------+               +--------------+
                ^  |                             ^     |
                |  |                             |     |
                |  |                             |     |
                |  |                             |     |
                |  |                             |     |
                |  |                             |     |
                |  |                             |     v
                |  |                          +--------------+
                |  |------------------------->|              |
                |                             |   Submit     |
                |-----------------------------|   Server     |
                                              |  (Server S)  |
                                              +--------------+
                      Figure 1: Lemonade Pull Model

    The Lemonade Pull Model allows a Messaging User Agent to compose and
    forward an e-mail combining fragments that are located in an IMAP
    server, without having to download these fragments to the server.

    In the [BURL]/[CATENATE] variant of the pull strategy, messages are
    initially composed and edited within an MUA.  The [CATENATE]
    extension to [RFC3501] is then used to upload the message to the IMAP
    server and assemble it, and finally a [URLAUTH] format URL is given
    to a [RFC2476] server with the [BURL] extension for submission.

    The flow involved to support such a use case consists of:
       M: {to I -- Optional} The client connectects to the IMAP server
      and IMAP Fetch of body structures and UIDs (See [RFC3501])

      Example:
            M: A0051 FETCH 161 (UID BODYSTRUCTURE)
            I: * 161 FETCH (UID 25627 BODYSTRUCTURE (("TEXT" "PLAIN"
      ("CHARSET" "US-ASCII") NIL
               NIL "7BIT" 1152 23)("TEXT" "PLAIN" ("CHARSET" "US-ASCII"
      "NAME"
               "cc.diff")
               "<960723163407.20117h@washington.example.net>" "Compiler
      diff"

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               "BASE64" 4554 73) "MIXED"))
            I: A0051 OK completed

       M: {to I} The client invokes CATENATE (See [CATENATE] for details
      of the semantics and steps  this allows the MUA to create messages
      on the IMAP using new data combined with body structure already
      present on the IMAP server.

      <<Editors note: Draft editing/catenation is omitted for now>>

         M: A0052 CATENATE Sent FLAGS (\Seen $MDNSent) TEXT {738}
         I: + Ready for literal data
         M: Return-Path: <bar@example.org>
         M: Received: from [127.0.0.2]
         M:           by rufus.example.org via TCP (internal) with
      ESMTPA;
         M:           Thu, 11 Nov 2004 16:57:07 +0000
         M: Message-ID: <419399E1.6000505@example.org>
         M: Date: Thu, 12 Nov 2004 16:57:05 +0000
         M: From: Bob Ar <bar@example.org>
         M: X-Accept-Language: en-us, en
         M: MIME-Version: 1.0
         M: To: foo@example.net
         M: Subject: About our holiday trip
         M: Content-Type: multipart/mixed;
         M:               boundary="------------030308070208000400050907"
         M:
         M: --------------030308070208000400050907
         M: Content-Type: text/plain; charset=us-ascii; format=flowed
         M: Content-Transfer-Encoding: 7bit
         M:
         M: Our travel agent has sent the updated schedule.
         M:
         M: Cheers,
         M: Bob
         M: --------------030308070208000400050907
         M:  URL "imap://imap.example.org/INBOX;UIDVALIDITY=385759045/;
            UID=25627;Section=1.2" TEXT {44}
         I: + Ready for literal data
         M: --------------030308070208000400050907--
         M:
         I: A0052 OK [APPENDUID 387899045 45] CATENATE Completed
         M: A0053 UID STORE XXX +FLAGS.SILENT ($Forwarded)
         I: A0053 OK STORE completed

      << Editors note: Recommend UIDPLUS extension  especially useful
      when appending messages to a non-selected mailbox>>

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       M: {to I} The client uses GENURLAUTH command to request and
      URLAUTH URL (See [URLAUTH]).
       I: {to M} The IMAP server returns URLAUTH URL suitable for later
      retrieval with URLFETCH (See [URLAUTH] for details of the semantics
      and steps).

      M: A0054 GENURLAUTH
      "imap://bob.ar@example.org/Sent;UIDVALIDITY=387899045/;uid=45/;urla
      uth=submit+bar" INTERNAL
             I: * GENURLAUTH
      "imap://bob.ar@example.org/Sent;UIDVALIDITY=387899045/;uid=45/;urla
      uth=submit+bar:internal:91354a473744909de610943775f92038"
             I: A0054 OK GENURLAUTH completed

       M: {to S} The client connects to the submission server and starts
      a new mail transaction. It uses BURL to let the submit server fetch
      the content of the message from the IMAP server (See [BURL] for
      details of the semantics and steps  this allows the MUA to
      authorize the submit server to access the message composed as a
      result of the CATENATE step).

      M: EHLO potter.example.org
         S: 250-owlry.example.com
         S: 250-8BITMIME
         S: 250-BURL imap
         S: 250-AUTH PLAIN
         S: 250-DSN
         S: 250 ENHANCEDSTATUSCODES
         M: AUTH PLAIN aGFycnkAaGFycnkAYWNjaW8=
         S: 235 2.7.0 PLAIN authentication successful.
         M: MAIL FROM:<bob.ar@example.org>
         S: 250 2.5.0 Address Ok.
         M: RCPT TO:<ron@gryffindor.example.com>
         S: 250 2.1.5 ron@gryffindor.example.com OK.
         M: BURL
      imap://bob.ar@example.org/Sent;UIDVALIDITY=387899045/;uid=45/;urlau
      th=submit+bar:internal:91354a473744909de610943775f92038 LAST

       S: {to I} The submission server uses URLFETCH to fetch the message
      to be sent (See [URLAUTH] for details of the semantics and steps.
      The so-called "pawn-ticket" authorization mechanism uses a URI
      which contains its own authorization credentials.).
       I: {to S} Provides the message composed as a result of the
      CATENATE step).

      Submission server opens IMAP connection to the IMAP server:

             I: * OK [CAPABILITY IMAP4REV1 URLAUTH] example.com IMAP
      server ready

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             S: a001 LOGIN submitserver secret
             I: a001 OK submitserver logged in
             S: a002 URLFETCH "
      imap://bob.ar@example.org/Sent;UIDVALIDITY=387899045/;uid=45/;urlau
      th=submit+bar:internal:91354a473744909de610943775f92038"
             I: * URLFETCH "
      imap://bob.ar@example.org/Sent;UIDVALIDITY=387899045/;uid=45/;urlau
      th=submit+bar:internal:91354a473744909de610943775f92038" {15065}
             ...message body follows...
             S: a002 OK URLFETCH completed

      << Editors note: The submission server may LOGOUT>>

       S2: {to M} OK (2XX)

      Submission server returns OK to the MUA:
         S: 250 2.5.0 Ok.

    The messaging user agent, mail server and submit server MUST support
    IMAPv4 Rev1 [RFC3501], CATENATE [CATENATE] and URLAUTH [URLAUTH].

2.5.
     Additional Considerations

    The so-called "pawn-ticket" authorization mechanism uses a URI which
    contains its own authorization credentials using [URLAUTH].  The
    advantage of this mechanism is that the submit [RFC2476] server can
    not access any data on the [RFC3501] server without a "pawn-ticket"
    created by the client.  The "pawn-ticket" grants acces only to the
    specific data that the submit [RFC2476] server is authorized to
    access, can be revoked by the client, and can have a time-limited
    validity.

2.6.
     The fcc problem

    The "fcc problem" refers to a frequent need to deliver a copy of the
    message to a "file carbon copy" recipient.  By far, the most common
    case of fcc is a client leaving a copy of outgoing mail in a "sent
    messages" or "outbox" mailbox.

    In the traditional strategy, the MUA duplicates the effort spent in
    transmitting to the MSA by writing the message to the fcc destination
    in a separate step.  This may be a write to a local disk file or an
    APPEND to a mailbox on an IMAP server.  The latter is one of the
    "excessive and repetitive network data transmissions" which
    represents the "problem" aspect of the "fcc problem".

    The [CATENATE] extension to [RFC3501] addresses the fcc problem.  It
    requires making several simplifying assumptions:

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        (1a) there is one, and only one, fcc destination on a single
    server
        (2a) the server which holds the fcc is the same as the server
    which stages the outgoing message for submission
        (3a) it is desired that the fcc be a copy of the complete message
    text with all external data inserted in the message

    << Editors note: [POSTADDRESS] can be used to address issues (1a)
    and (2a). To be done later>>

3.
   Media Conversion

3.1.
     Introduction

    <<Editors note: To be done when agreed by WG>>

3.2.
     Static media conversion

    <<Editors note: To be done when agreed by WG>>

3.3.
     Conversion of streamed media

    <<Editors note: To be done when agreed by WG>>

3.4.
     Quick Reconnect scheme

    Mobile operators usually charge users for the time their mobile
    client gets connected to the Internet and/or for the amount of
    information sent/received. Thus a mobile client should minimize time
    it stays connected to its mail server, which suggests that it should
    disconnect and reconnect frequently.

    Also, it is possible that the mobile client unexpectedly leaves area
    of connectivity, which will require that the client reconnects when
    connectivity returns.

    << Editors note: Discussion about voluntarily versa non-voluntarily
    disconnects might go here>>

    IMAP can be verbose. Usually, in order to synchronize a client with a
    server after a disconnect, the client needs to issue at least the
    following commands: LOGIN/AUTHENTICATE, SELECT and several FETCH
    commands (see [IMAP-DISC] for more details).

    Thus, there is a desire to have a quick reconnect facility in IMAP,
    which will give a mobile client ability to resume a previously
    abandoned session, without the need to perform the full
    synchronization sequence as described above.

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    << Editors note: Example is as per reconnect-02, syntax is subject
    to change>>

       S: * OK [CAPABILITY IMAP4REV1 STARTTLS AUTH=LOGIN CONDSTORE
          X-DRAFT-W02-RECONNECT] imap.example.com IMAP4rev1 2001.315rh
          at Thu, 15 Jul 2004 11:47:49 -0400 (EDT)
       C: b0002 authenticate login (SID P1234567890 56789
    20010715194045000
       41,43:211,214:541)
       S: + VXNlciBOYW1lAA==
       C: dGVzdDg=
       S: + UGFzc3dvcmQA
       C: dGVzdDg=
       S: * FOLDER INBOX
       S: * 464 EXISTS
       S: * 3 RECENT
       S: * OK [UIDVALIDITY 3857529045] UIDVALIDITY
       S: * OK [UIDNEXT 550] Predicted next UID
       S: * OK [HIGHESTMODSEQ 20010715194045007]
       S: * 1 FETCH (UID 1 FLAGS (\Seen))
       S: b0002 OK [CAPABILITY IMAP4REV1 IDLE NAMESPACE MAILBOX-REFERRALS
    SCAN
       SORT THREAD=REFERENCES THREAD=ORDEREDSUBJECT MULTIAPPEND] User
       test8 authenticated

4.
   Future work

    Future versions of the Lemonade profile are expected to address
    issues related to access of email form mobile devices, possibly
    including:
       - transport optimization for low or costly bandwidth and less
         reliable mobile networks
       - server to client notifications outside of the traditional IMAP
         band
       - dealing with firewall and intermediaries
       - compression
       - filtering

Security Considerations

    Security considerations on the Lemonade Pull Model are discussed
   throughout section 2.

    << Editors note: TBD (Reconnect, etc.)>>

References

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                           <Lemonade Profile>             February 2005

    [IMAP-DISC] Melnikov, A.  "Synchronization Operations For
       Disconnected Imap4 Clients", IMAP-DISC, work in progress,  draft-
       melnikov-imap-disc-XX.txt

    [RFC2119] Brader, S.  "Keywords for use in RFCs to Indicate
       Requirement Levels", RFC 2119, March 1997.
       http://www.ietf.org/rfc/rfc2119

    [RFC2180] Gahrns, M.  "IMAP4 Multi-Accessed Mailbox Practice", RFC
       2180, July 1997.
       http://www.ietf.org/rfc/rfc2180

    [RFC2234] Crocker, D. and Overell, P.  "Augmented BNF for Syntax
       Specifications", RFC 2234, Nov 1997.
       http://www.ietf.org/rfc/rfc2234

    [RFC2683] Leiba, B. "IMAP4 Implementation Recommendations", RFC 2683
       Sep 1999.
       http://www.ietf.org/rfc/rfc2683

    [RFC2821]  Klensin, J., "Simple Mail Transfer Protocol", RFC 2821,
       April 2001.

    [RFC2822] Resnick, P. "Internet Message Format", RFC 2822, April
       2001.  http://www.ietf.org/rfc/rfc2822

    [RFC3501] Crispin, M. "IMAP4, Internet Message Access Protocol
       Version 4 rev1", RFC 3501, March 2003.
       http://www.ietf.org/rfc/rfc3501

    [RFC2476] Gellens, R. and Klensin, J., "Message Submission", RFC
       2476, December 1998.

    [CATENATE]Resnick, P., "Internet Message Access Protocol (IMAP)
       CATENATE Extension", draft-ietf-lemonade-catenate-XX, (work in
      progress).

    [BURL]    Newman, C., "Message Composition", draft-ietf-lemonade-
       burl-xx (work in progress).

    [URLAUTH] Crispin, M. and Newman, C., "Internet Message Access
       Protocol (IMAP) - URLAUTH Extension", draft-ietf-lemonade-urlauth-
       XX.txt, (work in progress).

    [POSTADDRESS] Melnikov, A., "IMAP4 POSTADDRESS extension", work in
       progress, draft-melnikov-imap-postaddress-XX.txt

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    [RECONNECT] Melnikov, A. and C. Wilson, " IMAP4 extension for quick
       reconnect ", work in progress, draft-ietf-lemonade-reconnect-
       XX.txt

Version History

    [1] We removed the sections of the profile related to mobile e-mail
       as well as discussion. This will be part of the next version of
       the Lemonade profile work.
    [2] We added detailed examples for the different steps included in
       section 2.4.
    [3] We added section 3 on media conversion
    [4] We added examples on Quick reconnect schemes in section 4.
    [5] We updated the security considerations
    [6] We fixed references based on updates above
    [7] We added a future work section
    [8] We fixed the boiler plate statements on the Ùstatus of this memo
       and ÙCopriright.

Acknowledgments

    This document is based on the work in progress described in draft-
    crispin-lemonade-pull-xx.txt.

Authors Addresses

    Stephane H. Maes
    Oracle Corporation
    500 Oracle Parkway
   M/S 4op634
    Redwood Shores, CA 94065
    USA
    Phone: +1-650-607-6296
    Email: stephane.maes@oracle.com

    Alexey Melnikov
    Isode Limited
    5 Castle Business Village
    36 Station Road
    Hampton, Middlesex
    TW12 2BX
    UK
    Email: Alexey.melnikov@isode.com

Intellectual Property Statement

    The IETF takes no position regarding the validity or scope of any
    intellectual property or other rights that might be claimed to
    pertain to the implementation or use of the technology described in

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    this document or the extent to which any license under such rights
    might or might not be available; neither does it represent that it
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    The IETF invites any interested party to bring to its attention any
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Acknowledgement

    Funding for the RFC Editor function is currently provided by the
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Full Copyright Statement

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