Internet Message Access Protocol (IMAP) - STATUS=SIZE Extension
draft-bosch-imap-status-size-00
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Network Working Group S. Bosch
Internet-Draft Dovecot Oy
Intended status: Standards Track September 15, 2017
Expires: March 19, 2018
Internet Message Access Protocol (IMAP) - STATUS=SIZE Extension
draft-bosch-imap-status-size-00
Abstract
This document adds a new capability called "STATUS=SIZE" to the
Internet Message Access Protocol (IMAP). It allows retrieving the
total storage size of a mailbox with a single STATUS command rather
than retrieving and summing the sizes of all individual messages in
that mailbox.
Status of This Memo
This Internet-Draft is submitted 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
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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 March 19, 2018.
Copyright Notice
Copyright (c) 2017 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
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described in the Simplified BSD License.
Bosch Expires March 19, 2018 [Page 1]
Internet-Draft IMAP - STATUS=SIZE Extension September 2017
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions Used in This Document . . . . . . . . . . . . . . 2
3. STATUS Command and Response Extensions . . . . . . . . . . . 3
4. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 4
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
8.1. Normative References . . . . . . . . . . . . . . . . . . 4
8.2. Informative References . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
This document extends Internet Message Access Protocol (IMAP)
[IMAP4rev1] with a new capability called "STATUS=SIZE". To determine
the total storage size of a mailbox, an IMAP client currently needs
to retrieve all message sizes individually using the FETCH command
with the RFC822.SIZE data item. The "STATUS=SIZE" capability
provides a more efficient means to achieve this. It extends the
STATUS command with a new "SIZE" data item, which indicates the total
size of all messages in the target mailbox. This way, this
information can be queried with just one STATUS command. When the
"LIST-STATUS" IMAP capability [LIST-STATUS] is also available, the
SIZE data item can be queried for many mailboxes at once using just
one LIST command.
This capability is particularly useful for IMAP clients that do not
cache the state of the message store, such as most webmail clients.
Without the "STATUS=SIZE" capability, such clients need to fetch all
message sizes from the server when the size of a mailbox needs to be
determined, for example when the user requests detailed quota usage
information. The "QUOTA" capability [QUOTA] is no help in that
scenario, since the provided QUOTAROOT command can only yield the
"STORAGE" resource usage of a whole quota root, but not for a single
mailbox within that root.
2. Conventions Used in This Document
In examples, "C:" indicates lines sent by a client that is connected
to a server. "S:" indicates lines sent by the server to the client.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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