IMAP Extensions: Quick Flag Changes Resynchronization (CONDSTORE) and Quick Mailbox Resynchronization (QRESYNC) (RFC7162)
Original Publication Date: 2014-May-01
Included in the Prior Art Database: 2014-May-24
Internet Society Requests For Comment (RFCs)
A. Melnikov: AUTHOR [+2]
Often, multiple IMAP [RFC3501] clients need to coordinate changes to a common IMAP mailbox. Examples include different clients working on behalf of the same user and clients representing multiple users accessing shared mailboxes. These clients need a mechanism to synchronize state changes for messages within the mailbox. The Conditional Store ("CONDSTORE") facility allows a client to quickly resynchronize mailbox flag changes.
Internet Engineering Task Force (IETF) A. Melnikov Request for Comments: 7162 Isode Ltd Obsoletes: 4551, 5162 D. Cridland Updates: 2683 Surevine Ltd Category: Standards Track May 2014 ISSN: 2070-1721
IMAP Extensions: Quick Flag Changes Resynchronization (CONDSTORE) and Quick Mailbox Resynchronization (QRESYNC)
Often, multiple IMAP (RFC 3501) clients need to coordinate changes to a common IMAP mailbox. Examples include different clients working on behalf of the same user and multiple users accessing shared mailboxes. These clients need a mechanism to efficiently synchronize state changes for messages within the mailbox.
Initially defined in RFC 4551, the Conditional Store facility provides a protected update mechanism for message state information and a mechanism for requesting only changes to the message state. This memo updates that mechanism and obsoletes RFC 4551, based on operational experience.
This document additionally updates another IMAP extension, Quick Resynchronization, which builds on the Conditional STORE extension to provide an IMAP client the ability to fully resynchronize a mailbox as part of the SELECT/EXAMINE command, without the need for additional server-side state or client round trips. Hence, this memo obsoletes RFC 5162.
Finally, this document also updates the line-length recommendation in Section 22.214.171.124 of RFC 2683.
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/rfc7162.
Cridland Standards Track [Page 1]
RFC 7162 IMAP CONDSTORE & QRESYNC May 2014
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