Sieve Email Filtering: Detecting Duplicate Deliveries
draft-ietf-appsawg-sieve-duplicate-05

The information below is for an old version of the document
Document Type Active Internet-Draft (appsawg WG)
Author Stephan Bosch 
Last updated 2014-05-28 (latest revision 2014-05-23)
Replaces draft-bosch-sieve-duplicate
Stream Internent Engineering Task Force (IETF)
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Stream WG state Submitted to IESG for Publication
Document shepherd Ned Freed
Shepherd write-up Show (last changed 2014-05-23)
IESG IESG state AD Evaluation::Revised I-D Needed
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Responsible AD Barry Leiba
Send notices to appsawg-chairs@tools.ietf.org, draft-ietf-appsawg-sieve-duplicate@tools.ietf.org, ned+ietf@mrochek.com
APPSAWG                                                         S. Bosch
Internet-Draft                                              May 23, 2014
Intended status: Standards Track
Expires: November 24, 2014

         Sieve Email Filtering: Detecting Duplicate Deliveries
                 draft-ietf-appsawg-sieve-duplicate-05

Abstract

   This document defines a new test command "duplicate" for the "Sieve"
   email filtering language.  This test adds the ability to detect
   duplications.  The main application for this new test is handling
   duplicate deliveries commonly caused by mailing list subscriptions or
   redirected mail addresses.  The detection is normally performed by
   matching the message ID to an internal list of message IDs from
   previously delivered messages.  For more complex applications, the
   "duplicate" test can also use the content of a specific header or
   other parts of the message.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on November 24, 2014.

Copyright Notice

   Copyright (c) 2014 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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   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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  3
   3.  Test "duplicate" . . . . . . . . . . . . . . . . . . . . . . .  3
     3.1.  Arguments ":header" and ":uniqueid"  . . . . . . . . . . .  5
     3.2.  Argument ":handle" . . . . . . . . . . . . . . . . . . . .  6
     3.3.  Arguments ":seconds" and ":last" . . . . . . . . . . . . .  7
     3.4.  Interaction with Other Sieve Extensions  . . . . . . . . .  8
   4.  Sieve Capability Strings . . . . . . . . . . . . . . . . . . .  8
   5.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     5.1.  Example 1  . . . . . . . . . . . . . . . . . . . . . . . .  8
     5.2.  Example 2  . . . . . . . . . . . . . . . . . . . . . . . .  9
     5.3.  Example 3  . . . . . . . . . . . . . . . . . . . . . . . .  9
     5.4.  Example 4  . . . . . . . . . . . . . . . . . . . . . . . . 10
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 11
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 12
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 12
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 13
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 13

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1.  Introduction

   This document specifies an extension to the Sieve filtering language
   defined by RFC 5228 [SIEVE].  It adds a test to track whether or not
   a text string was seen before by the delivery agent in an earlier
   execution of the Sieve script.  This can be used to detect and handle
   duplicate message deliveries.

   Duplicate deliveries are a common side-effect of being subscribed to
   a mailing list.  For example, if a member of the list decides to
   reply to both the user and the mailing list itself, the user will
   often get one copy of the message directly and another through the
   mailing list.  Also, if someone cross-posts over several mailing
   lists to which the user is subscribed, the user will likely receive a
   copy from each of those lists.  In another scenario, the user has
   several redirected mail addresses all pointing to his main mail
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