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Versions: 00                                                            
Network Working Group                                           D. Royer
Internet-Draft                                           INET-Consulting
Expires: December 13, 2003                                 June 14, 2003


 IMAP-PROXY service for mobile clients to do submitting and forwarding
                     draft-royer-lemonade-submit-00

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   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.

   This Internet-Draft will expire on December 13, 2003.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This memo describes a method that allows mobile clients to use the
   IMAP protocol and submit messages to a IMAP-PROXY service that
   understands [E]SMTP and IMAP.












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Table of Contents

   1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3. SUBMIT command . . . . . . . . . . . . . . . . . . . . . . . . . 4
   4. CAPABILITY interception  . . . . . . . . . . . . . . . . . . . . 6
      Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 6
      Full Copyright Statement . . . . . . . . . . . . . . . . . . . . 7











































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1. Introduction

   As many mobile devices are both memory and bandwidth limited there
   needs to be a way for mobile devices to forward and include existing
   messages and body parts to others using email without downloading.

   This is a memo released as part of the discussions on the 'LEMONADE'
   working group.  The idea is that a IMAP-PROXY service can sit on top
   of an IMAP and [E]SMTP server in order to allow mobile devices the
   ability to submit and retrieve e-mail through one port.

   The basic idea is that the IMAP aware client sends normal IMAP
   commands to the IMAP server and gets normal IMAP responses.  The IMAP
   client can not tell that it is passing through a IMAP-PROXY and
   submit service.

   How the messages and body part are included is not described in the
   memo.  The memo concentrates on the IMAP-PROXY service itself at the
   functional level.

   IMAP-PROXY servers that support this extension MUST list the keyword
   CAN-SUBMIT in their CAPABILITY response.  No client action is needed
   to invoke the CAN-SUBMIT capability in a server.

2. Overview

   The IMAP-PROXY service sits on top of both IMAP and an SMTP service.
























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                  +---------+  +---------+
                  | STANDARD|  | SUBMIT  |
                  | IMAP    |  | IMAP    |
                  | CLIENT  |  | CLIENT  |
                  +---------+  +---------+
                       \           /
                        \         /
                         .       .
                          .     .
                             .
                             |
                             |
                       +----------+
                       |  PROXY   |
                       +----------+
                         /      \
                        /        \
                       |          |
                    +------+   +------+
                    | IMAP |   | SMTP |
                    |SERVER|   |SERVER|
                    +------+   +------+


   The IMAP-PROXY passes all IMAP commands (except SUBMIT) to the IMAP
   server and passes all IMAP responses back to both the standard and
   submit IMAP clients.

   The SUBMIT command is intercepted by the IMAP-PROXY server.  It reads
   the contents of the message sent by the submit aware IMAP client,
   includes or forward any messages as specified in the content of the
   submit message.  And send SUBMIT responses back to the SUBMIT aware
   client.

3. SUBMIT command

   Arguments:  message literal

   Responses:  no specific responses for this command

   Result:     OK - append completed
               NO - append error: can't send message.
               BAD - command unknown or arguments invalid

   The SUBMIT command submits the literal argument as a new message to
   the users specified in the message.  This argument MUST be in the
   format of an [RFC-822] message.  8-bit characters are permitted in
   the message.  A server implementation that is unable to preserve 8-



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   bit data properly MUST be able to reversibly convert 8-bit SUBMIT
   data to 7-bit using a [MIME-IMB] content transfer encoding.

   The IMAP-PROXY service may check and alter the SMTP headers to ensure
   they conform to site requirements.  This may include making sure the
   'From:' line is valid within the site.  Might include replacing the
   Message-Id, removing any Received-By lines, Date, and so on.

   A successful submit simply means that the SMTP server accepted all
   recipients and the message for submission.  Just like with any other
   SMTP submission recipient errors will bounce back to the users INBOX.


   Example:    C: A003 SUBMIT {356}
               C: Date: Mon, 7 Feb 1994 21:52:25 -0800 (PST)
               C: From: Fred Foobar <foobar@Blurdybloop.COM>
               C: Subject: afternoon meeting
               C: To: mooch@owatagu.siam.edu,badUser@example.com,
                   unknownUser@example.com
               C: Message-Id: <B27397-0100000@Blurdybloop.COM>
               C: MIME-Version: 1.0
               C: Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
               C:
               C: Hello Joe, do you think we can meet at 3:30 tomorrow?
               C:
               S: A003 OK SUBMIT completed


   If there is an SMTP error the IMAP-PROXY service returns any message
   followed by any unacceptable recipients.  The message is a comma
   separated string with the non-recipient errors listed first followed
   by one or more recipients that are invalid.  A NO response indicates
   that no message was sent to any recipient.


   This example two users were rejected. The first message
   section is empty (message starts with a comma).

   S: A123 NO ,badUser@example.com,unknownUser@example.com

   An error message not specific to any user. The non
   recipient part of the message must not include a comma
   as a comma separates the parts of the error message.
   And the comma is not part of the message itself.

   S: A445 NO MX server not responding,





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4. CAPABILITY interception

   The IMAP-PROXY intercepts the CAPABILITY response from the IMAP
   server and adds the CAN-SUBMIT capability to the list.


Author's Address

   Doug Royer
   INET-Consulting.com
   1795 W. Broadway #266
   Idaho Falls, Idaho  83402
   US

   Phone: 208-520-4044
   Fax:   866-594-8574
   EMail: Doug@Royer.com
   URI:   http://Royer.com/People/Doug

































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Full Copyright Statement

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
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   The limited permissions granted above are perpetual and will not be
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   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
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   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















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