IMAP LIST Extension for Special-Use Mailboxes
RFC 6154
Internet Engineering Task Force (IETF) B. Leiba
Request for Comments: 6154 Huawei Technologies
Category: Standards Track J. Nicolson
ISSN: 2070-1721 Google
March 2011
IMAP LIST Extension for Special-Use Mailboxes
Abstract
Some IMAP message stores include special-use mailboxes, such as those
used to hold draft messages or sent messages. Many mail clients
allow users to specify where draft or sent messages should be put,
but configuring them requires that the user know which mailboxes the
server has set aside for these purposes. This extension adds new
optional mailbox attributes that a server may include in IMAP LIST
command responses to identify special-use mailboxes to the client,
easing configuration.
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/rfc6154.
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
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Leiba & Nicolson Standards Track [Page 1]
RFC 6154 IMAP LIST: Special-Use Mailboxes March 2011
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Conventions Used in This Document . . . . . . . . . . . . 3
2. New Mailbox Attributes Identifying Special-Use Mailboxes . . . 3
3. Extension to IMAP CREATE Command to Set Special-Use
Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. IMAP METADATA Entry for Special-Use Attributes . . . . . . . . 6
5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1. Example of an IMAP LIST Command . . . . . . . . . . . . . 7
5.2. Example of an Extended IMAP LIST Command . . . . . . . . . 7
5.3. Example of an IMAP CREATE Command . . . . . . . . . . . . 8
5.4. Example of Using IMAP METADATA to Manipulate
Special-Use Attributes . . . . . . . . . . . . . . . . . . 8
6. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
8.1. Registration of USEATTR IMAP Response Code . . . . . . . . 10
8.2. Registration of CREATE-SPECIAL-USE IMAP Capability . . . . 10
8.3. Registration of SPECIAL-USE IMAP Capability . . . . . . . 10
8.4. Registration of SPECIAL-USE Selection Option . . . . . . . 10
8.5. Registration of SPECIAL-USE Return Option . . . . . . . . 11
8.6. Registration of SPECIAL-USE Metadata . . . . . . . . . . . 11
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1. Normative References . . . . . . . . . . . . . . . . . . . 12
9.2. Informative References . . . . . . . . . . . . . . . . . . 12
Leiba & Nicolson Standards Track [Page 2]
RFC 6154 IMAP LIST: Special-Use Mailboxes March 2011
1. Introduction
Some IMAP message stores include special-use mailboxes, such as those
used to hold draft messages or sent messages. Many mail clients
allow users to specify where draft or sent messages should be put,
but configuring them requires that the user know which mailboxes the
server has set aside for these purposes. This extension adds new
optional mailbox attributes that a server may include in IMAP LIST
command responses to identify special-use mailboxes to the client,
easing configuration.
In addition, this extension adds an optional parameter on the IMAP
CREATE command, allowing a client to assign a special use to a
mailbox when it is created. Servers may choose to support this part
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