IMAP4 Extensions for Quick Mailbox Resynchronization
draft-ietf-qresync-rfc5162bis-01

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Document Type Active Internet-Draft (qresync WG)
Last updated 2013-07-01
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Network Working Group                                        A. Melnikov
Internet-Draft                                                 Isode Ltd
Obsoletes: 5162 (if approved)                                D. Cridland
Updates: 4315 (if approved)                                       Arcode
Intended status: Standards Track                           July 01, 2013
Expires: January 02, 2014

          IMAP4 Extensions for Quick Mailbox Resynchronization
                  draft-ietf-qresync-rfc5162bis-01.txt

Abstract

   This document defines an IMAP4 extension, which gives an IMAP client
   the ability to quickly resynchronize any previously opened mailbox as
   part of the SELECT command, without the need for server-side state or
   additional client round-trips.  This extension also introduces a new
   response that allows for a more compact representation of a list of
   expunged messages (and always includes the Unique Identifiers (UIDs)
   expunged).

Status of This Memo

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   This Internet-Draft will expire on January 02, 2014.

Copyright Notice

   Copyright (c) 2013 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

Melnikov & Cridland     Expires January 02, 2014                [Page 1]
Internet-Draft          IMAP Quick Mailbox Resync              July 2013

   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.

Table of Contents

   1.  Introduction and Overview . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Notation . . . . . . . . . . . . . . . . . . . .   4
   3.  IMAP Protocol Changes . . . . . . . . . . . . . . . . . . . .   4
     3.1.  QRESYNC Parameter to SELECT/EXAMINE . . . . . . . . . . .   5
     3.2.  VANISHED UID FETCH Modifier . . . . . . . . . . . . . . .   9
     3.3.  EXPUNGE Command . . . . . . . . . . . . . . . . . . . . .  10
     3.4.  CLOSE Command . . . . . . . . . . . . . . . . . . . . . .  11
     3.5.  UID EXPUNGE Command . . . . . . . . . . . . . . . . . . .  12
     3.6.  VANISHED Response . . . . . . . . . . . . . . . . . . . .  13
     3.7.  CLOSED Response Code  . . . . . . . . . . . . . . . . . .  16
   4.  Server Implementation Considerations  . . . . . . . . . . . .  16
     4.1.  Server Implementations That Don't Store Extra State . . .  16
     4.2.  Server Implementations Storing Minimal State  . . . . . .  17
     4.3.  Additional State Required on the Server . . . . . . . . .  17
   5.  Updated Synchronization Sequence  . . . . . . . . . . . . . .  18
   6.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . .  21
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  22
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  22
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  22
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  23
     10.2.  Informative References . . . . . . . . . . . . . . . . .  23
   Appendix A.  Changes since RFC 5162 . . . . . . . . . . . . . . .  24
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  24

1.  Introduction and Overview

   The [CONDSTORE] extension gives a disconnected client the ability to
   quickly resynchronize IMAP flag changes for previously seen messages.
   This can be done using the CHANGEDSINCE FETCH modifier once a mailbox
   is opened.  In order for the client to discover which messages have
   been expunged, the client still has to issue a UID FETCH or a UID
   SEARCH command.  This document defines an extension to [CONDSTORE]
   that allows a reconnecting client to perform full resynchronization,
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