Internet Message Access Protocol (IMAP) - SAVEDATE Extension
draft-bosch-imap-savedate-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) - SAVEDATE Extension
                      draft-bosch-imap-savedate-00

Abstract

   This document adds a new capability called "SAVEDATE" to the Internet
   Message Access Protocol (IMAP).  It defines a new IMAP message
   attribute called 'save date' that, unlike the existing 'internal
   date' attribute, always indicates the moment at which the message was
   saved in its current mailbox.  The SAVEDATE capability extends the
   FETCH command with the means to retrieve the save date attribute and
   it extends the SEARCH command to allow using that attribute in
   searching criteria.

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 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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   carefully, as they describe your rights and restrictions with respect
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Bosch                    Expires March 19, 2018                 [Page 1]
Internet-Draft          IMAP - SAVEDATE Extension         September 2017

   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   3.  Save Date Message Attribute . . . . . . . . . . . . . . . . .   3
   4.  IMAP Protocol Changes . . . . . . . . . . . . . . . . . . . .   4
     4.1.  CAPABILITY Identification . . . . . . . . . . . . . . . .   4
     4.2.  FETCH Command and Response Extensions . . . . . . . . . .   4
     4.3.  SEARCH Command Extension  . . . . . . . . . . . . . . . .   4
   5.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   This document extends Internet Message Access Protocol (IMAP)
   [IMAP4rev1] with a new capability called "SAVEDATE".  This capability
   adds a new IMAP message attribute called 'save date'.  The save date
   is the date and time at which a message was saved in the mailbox it
   currently resides.  The save date is similar to the existing internal
   date attribute in that it is set at the time of delivery.  However,
   the internal date attribute can be set to an arbitrary value for
   messages delivered to the mailbox using the APPEND command and it is
   usually copied from the source message for messages delivered using
   the COPY command.  In contrast, the save date attribute is always set
   to the current date and time at the moment the message is saved in
   the mailbox, irrespective of how the message is delivered and from
   where it originates.

   The save date message attribute is useful for implementing automated
   removal of messages from a mailbox after a configured amount of time.
   For that application, it is necessary to know when the message was
   saved in the mailbox, which cannot be reliably determined using the
   the internal date attribute.

   For example, a common client usage pattern is to move deleted
   messages to a Trash mailbox [FIXME: reference to SPECIAL-USE RFC for
   discussion on semantics of a "trash" mailbox (?)]; these messages are
   considered "deleted" at the time they are moved to the Trash mailbox.
   In an effort to limit the size of the Trash mailbox, a client may
   subsequently desire to permanently remove (expunge) all messages in
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