IMAP $Important Keyword and \Important Special-Use Attribute
draft-ietf-extra-specialuse-important-03

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Network Working Group                                      B. Leiba, Ed.
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                            May 01, 2018
Expires: October 31, 2018

      IMAP $Important Keyword and \Important Special-Use Attribute
                draft-ietf-extra-specialuse-important-03

Abstract

   RFC 6154 created an IMAP Special-Use LIST extension and defined an
   initial set of attributes.  This document defines a new attribute,
   "\Important", and establishes a new IANA registry for IMAP folder
   attributes, registering the attributes defined in RFCs 3348, 3501,
   and 6154.  This document also defines a new IMAP keyword,
   "$Important", and registers it in the registry defined in RFC 5788.

Status of this Memo

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

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   This Internet-Draft will expire on October 31, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   Please review these documents carefully, as they describe your rights
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   1.1.  Conventions used in this document  . . . . . . . . . . . . .  2

Leiba                   Expires October 31, 2018                [Page 1]
Internet-Draft   IMAP "Important" Keyword and Attribute         May 2018

   2.  Definition of the '$Important' Message Keyword . . . . . . . .  2
   3.  Definition of the 'Important' Mailbox Attribute  . . . . . . .  3
   3.1.  Formal Syntax  . . . . . . . . . . . . . . . . . . . . . . .  3
   3.2.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.2.1.  Example of a LIST Response . . . . . . . . . . . . . . . .  3
   3.2.2.  Examples of Creating a New Mailbox using \Important  . . .  4
   4.  Implementation Notes . . . . . . . . . . . . . . . . . . . . .  4
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . .  5
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  5
   6.1.  Registration of the $Important keyword . . . . . . . . . . .  5
   6.2.  Creation of the IMAP Mailbox Name Attributes Registry  . . .  6
   6.2.1.  Instructions to the Designated Expert  . . . . . . . . . .  7
   6.3.  Initial Entries for the IMAP Mailbox Name Attributes Registry 7
   7.  Changes During Document Development  . . . . . . . . . . . . .  8
   8.  Contributors . . . . . . . . . . . . . . . . . . . . . . . . .  9
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
   9.1.  Normative References . . . . . . . . . . . . . . . . . . . .  9
   9.2.  Informative References . . . . . . . . . . . . . . . . . . . 10
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.  Introduction

   The Internet Message Access Protocol (IMAP) specification [RFC3501]
   defines the use of message keywords, and an IMAP Keywords registry is
   created in [RFC5788].  [RFC6154] defines an extension to the IMAP
   LIST command for special-use mailboxes.  The extension allows servers
   to provide extra information (attributes) about the purpose of a
   mailbox and defines an initial set of special-use attributes.

   This document does the following:

   o  Defines a new message keyword, "$Important", to apply to messages
      that are considered important for the user, by some externally
      defined criteria.

   o  Registers the "$Important" keyword in the IMAP Keywords registry.

   o  Defines a new special-use attribute, "\Important", to designate a
      mailbox that will hold messages that are considered important for
      the user, by some externally defined criteria.

   o  Creates a registry for IMAP mailbox attributes and registers the
      new attribute and those defined in [RFC3348], [RFC3501], and