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Sieve Extension: Relational Tests (RFC3431)

IP.com Disclosure Number: IPCOM000010465D
Original Publication Date: 2002-Nov-01
Included in the Prior Art Database: 2002-Dec-05
Document File: 9 page(s) / 13K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Segmuller: AUTHOR

Abstract

This document describes the RELATIONAL extension to the Sieve mail filtering language defined in RFC 3028. This extension extends existing conditional tests in Sieve to allow relational operators. In addition to testing their content, it also allows for testing of the number of entities in header and envelope fields.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 22% of the total text.

Network Working Group                                       W. Segmuller

Request for Comment: 3431                IBM T.J. Watson Research Center

Category: Standards Track                                  December 2002

                   Sieve Extension: Relational Tests

Status of this Memo

   This document specifies an Internet standards track protocol for the

   Internet community, and requests discussion and suggestions for

   improvements.  Please refer to the current edition of the "Internet

   Official Protocol Standards" (STD 1) for the standardization state

   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   This document describes the RELATIONAL extension to the Sieve mail

   filtering language defined in RFC 3028.  This extension extends

   existing conditional tests in Sieve to allow relational operators.

   In addition to testing their content, it also allows for testing of

   the number of entities in header and envelope fields.

1 Introduction

   Sieve [SIEVE] is a language for filtering e-mail messages at the time

   of final delivery.  It is designed to be implementable on either a

   mail client or mail server.  It is meant to be extensible, simple,

   and independent of access protocol, mail architecture, and operating

   system.  It is suitable for running on a mail server where users may

   not be allowed to execute arbitrary programs, such as on black box

   Internet Messages Access Protocol (IMAP) servers, as it has no

   variables, loops, nor the ability to shell out to external programs.

   The RELATIONAL extension provides relational operators on the

   address, envelope, and header tests.  This extension also provides a

   way of counting the entities in a message header or address field.

   With this extension, the sieve script may now determine if a field is

   greater than or less than a value instead of just equivalent.  One

   use is for the x-priority field: move messages with a priority

   greater than 3 to the "work on later" folder.  Mail could also be

   sorted by the from address.  Those userids that start with 'a'-'m' go

   to one folder, and the rest go to another folder.

Segmuller                   Standards Track                     [Page 1]

RFC 3431           Sieve Extension: Relational Tests       December 2002

   The sieve script can also determine the number of fields in the

   header, or the number of addresses in a recipient field.  For

   example:  are there more than 5 addresses in the to and cc fields.

2 Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this

   document are to...