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The IMAP APPENDLIMIT Extension (RFC7889)

IP.com Disclosure Number: IPCOM000246757D
Original Publication Date: 2016-May-01
Included in the Prior Art Database: 2016-Jun-29
Document File: 14 page(s) / 14K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. SrimushnamBoovaraghamoorthy: AUTHOR [+2]

Abstract

Some IMAP servers have limits for message upload size, and those limits are not published to the email client. When the email client APPENDs a message with huge attachments, using non-synchronizing literals, the APPEND fails because of the upload limit, but the client has already sent the message data anyway. This results in unnecessary resource usage. Especially in the mobile device environment, appending a message with huge attachments consumes device resources like device battery power and mobile data.

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Internet Engineering Task Force (IETF)    J. SrimushnamBoovaraghamoorthy Request for Comments: 7889                                      N. Bisht Category: Standards Track                    Samsung Electronics America ISSN: 2070-1721                                                 May 2016

                      The IMAP APPENDLIMIT Extension

Abstract

   This document defines an extension to the IMAP service whereby a    server can inform the client about maximum message upload sizes,    allowing the client to avoid sending APPEND commands that will fail    because the messages are too large.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc7889.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    (http://trustee.ietf.org/license-info) in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

 SrimushnamB. & Bisht         Standards Track                    [Page 1]
 RFC 7889             The IMAP APPENDLIMIT Extension             May 2016

 Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2

     1.1.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   2

   2.  APPENDLIMIT Extension . . . . . . . . . . . . . . . . . . . .   3

   3.  Mailbox-Specific APPENDLIMIT  . . . . . . . . . . . . . . . .   3

     3.1.  STATUS Response to the STATUS Command . . . . . . . . . .   4

     3.2.  STATUS Response to the LIST Command . . . . . . . . . . .   4

     3.3.  APPENDLIMIT Behavior  . . . . . . . . . . . . . . . . . .   4

   4.  APPEND Response . . . . . . . . . . . . . . . . . . . . . . .   4

   5.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . ....