IMAP Support for UTF-8
draft-ietf-eai-5738bis-03

The information below is for an old version of the document
Document Type Active Internet-Draft (eai WG)
Authors Pete Resnick  , Chris Newman  , Sean Shen 
Last updated 2011-06-10 (latest revision 2011-03-30)
Replaces draft-ietf-eai-5378bis
Stream IETF
Intended RFC status Proposed Standard
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Responsible AD Pete Resnick
Send notices to eai-chairs@tools.ietf.org, draft-ietf-eai-5738bis@tools.ietf.org
Internet Engineering Task Force                          P. Resnick, Ed.
Internet-Draft                                     Qualcomm Incorporated
Obsoletes: RFC5738 (if approved)                          C. Newman, Ed.
Intended status: Standards Track                                  Oracle
Expires: June 28, 2012                                      S. Shen, Ed.
                                                                   CNNIC
                                                       December 26, 2011

                         IMAP Support for UTF-8
                       draft-ietf-eai-5738bis-03

Abstract

   This specification extends the Internet Message Access Protocol
   version 4rev1 (IMAP4rev1) to support UTF-8 encoded international
   characters in user names, mail addresses and message headers.  This
   specification replaces RFC 5738.

Status of This Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on June 28, 2012.

Copyright Notice

   Copyright (c) 2011 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

Resnick, et al.           Expires June 28, 2012                 [Page 1]
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions Used in this Document  . . . . . . . . . . . . . .  3
   3.  UTF8=ACCEPT IMAP Capability  . . . . . . . . . . . . . . . . .  3
     3.1.  IMAP UTF-8 Quoted Strings  . . . . . . . . . . . . . . . .  4
     3.2.  UTF8 Parameter to SELECT and EXAMINE . . . . . . . . . . .  5
     3.3.  UTF-8 LIST and LSUB Responses  . . . . . . . . . . . . . .  6
     3.4.  UTF-8 Interaction with IMAP4 LIST Command Extensions . . .  6
       3.4.1.  UTF8 LIST Selection Option . . . . . . . . . . . . . .  6
       3.4.2.  UTF8 LIST Return Option  . . . . . . . . . . . . . . .  7
   4.  IMAP UTF8 Append Data Extension  . . . . . . . . . . . . . . .  8
   5.  LOGIN Command and UTF-8  . . . . . . . . . . . . . . . . . . .  9
   6.  UTF8=ONLY Capability . . . . . . . . . . . . . . . . . . . . .  9
   7.  Issues with UTF-8 Header Mailstore . . . . . . . . . . . . . .  9
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 11
     10.2. Informative References . . . . . . . . . . . . . . . . . . 12
   Appendix A.  Appendix A. Design Rationale  . . . . . . . . . . . . 13
   Appendix B.  Appendix B. Acknowledgments . . . . . . . . . . . . . 13

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1.  Introduction

   This specification extends IMAP4rev1 [RFC3501] to permit UTF-8
   [RFC3629] in headers as described in "Internationalized Email
   Headers" [I-D.ietf-eai-rfc5335bis] .  It also adds a mechanism to
   support mailbox names, login names, and passwords using the UTF-8
   charset.  This specification creates two new IMAP capabilities to
   allow servers to advertise these new extensions, along with one new
   IMAP LIST selection option and a new IMAP LIST return option.

   This specification permits implementation of an IMAP server that
   hides mailboxes with internationalized email messages from IMAP
   clients that do not support this extension.  Implementation of "Post-
   delivery Message Downgrading for Internationalized Email Messages"
   [popimap-downgrade] is necessary for an MDA to make mailboxes with
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