IMAP "$Important" Keyword and "\Important" Special-Use Attribute
RFC 8457
Internet Engineering Task Force (IETF) B. Leiba, Ed.
Request for Comments: 8457 Huawei Technologies
Category: Standards Track September 2018
ISSN: 2070-1721
IMAP "$Important" Keyword and "\Important" Special-Use Attribute
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, which include the attributes defined in RFCs 5258, 3501,
and 6154. This document also defines a new IMAP keyword,
"$Important", and registers it in the registry defined in RFC 5788.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8457.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Leiba Standards Track [Page 1]
RFC 8457 IMAP "Important" Keyword and Attribute September 2018
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions Used in This Document . . . . . . . . . . . . . 3
2. Definition of the "$Important" Message Keyword . . . . . . . 3
3. Definition of the 'Important' Mailbox Attribute . . . . . . . 3
3.1. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . 4
3.2. Examples . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2.1. Example of a LIST Response . . . . . . . . . . . . . . . 4
3.2.2. Examples of Creating a New Mailbox Using "\Important" . . 4
4. Implementation Notes . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
6.1. Registration of the "$Important" Keyword . . . . . . . . . 6
6.2. Creation of the IMAP Mailbox Name Attributes Registry . . . 7
6.2.1. Instructions to the Designated Expert . . . . . . . . . . 8
6.3. Initial Entries for the IMAP Mailbox Name Attributes
Registry . . . . . . . . . . . . . . . . . . . . . . . . . 9
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.1. Normative References . . . . . . . . . . . . . . . . . . . 10
7.2. Informative References . . . . . . . . . . . . . . . . . . 10
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
The Internet Message Access Protocol (IMAP) specification [RFC3501]
defines the use of message keywords, and an "IMAP Keywords" registry
is created in [RFC5788]. [RFC6154] defines an extension to the IMAP
LIST command for special-use mailboxes. The extension allows servers
to provide extra information (attributes) about the purpose of a
mailbox and defines an initial set of special-use attributes.
This document does the following:
o defines a new message keyword, "$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; and
Leiba Standards Track [Page 2]
RFC 8457 IMAP "Important" Keyword and Attribute September 2018
o creates a registry for IMAP mailbox attributes and registers the
new attribute and those defined in [RFC5258], [RFC3501], and
[RFC6154].
1.1. Conventions Used in This Document
In the examples used in this document, "C:" indicates lines sent by a
Show full document text