A Property Types Registry for the Authentication-Results Header Field

The information below is for an old version of the document
Document Type Active Internet-Draft (appsawg WG)
Author Murray Kucherawy 
Last updated 2014-08-11
Replaces draft-kucherawy-authres-ptypes-registry
Stream IETF
Intended RFC status Proposed Standard
Formats pdf htmlized (tools) htmlized bibtex
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Document shepherd Scott Kitterman
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Individual submission                                       M. Kucherawy
Internet-Draft                                           August 10, 2014
Updates: 7001 (if approved)
Intended status: Standards Track
Expires: February 11, 2015

 A Property Types Registry for the Authentication-Results Header Field


   [RFC7001] describes a header field called Authentication-Results for
   use with electronic mail messages to indicate the results of message
   authentication efforts.  Any receiver-side software, such as mail
   filters or Mail User Agents (MUAs), can add or use this header field
   to relay that information in a convenient and meaningful way to
   users, or make sorting and filtering decisions.

   One portion of the definition in that document limits the types of
   authentication properties about a message to a small, fixed set.
   This document updates the specification to allow new property types
   to be declared and used.

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 February 11, 2015.

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

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   (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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Updated 'ptype' Definition  . . . . . . . . . . . . . . . . . . 3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  Normative References  . . . . . . . . . . . . . . . . . . . . . 5
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . . . 5

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1.  Introduction

   [RFC7001] describes a header field called Authentication-Results for
   electronic mail messages that presents the results of a message
   authentication effort in a machine-readable format.  The intent of
   the header field is to create a place to collect such data when
   message authentication mechanisms are in use so that a Mail User
   Agent (MUA) and downstream filters can make filtering decisions
   and/or provide a recommendation to the user as to the validity of the
   message's origin and possibly the safety and integrity of its

   The specification in that document enumerated a small set of types of
   properties that can be reported using this mechanism.  There has
   emerged a desire to report types of properties about a message
   through this mechanism.  Accordingly, this document updates the
   specification to allow for additional property types ("ptypes")
   beyond the original set, and creates a registry where new ones can be
   listed and their defining documents referenced.

2.  Updated 'ptype' Definition

   Advanced Backus Naur Form (ABNF) is defined in [RFC5234].

   The ABNF in Section 2.2 of [RFC7001] is updated as follows:

       ptype = Keyword
             ; indicates whether the property being evaluated was
             ; a parameter to an [SMTP] command, was a value taken
             ; from a message header field, was some property of
             ; the message body, or was some other property evaluated by
             ; the receiving MTA

   The ABNF token "Keyword" is defined in Section 4.1.2 of [RFC5321].

   Legal values of "ptype" are as defined in this document, or in the
   IANA "Email Authentication Property Types" registry (see Section 3).
   The initial values are as follows, matching those defined in
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