Resolution of The SPF/Sender-ID Experiment
draft-ietf-spfbis-experiment-01

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SPFBIS Working Group                                        M. Kucherawy
Internet-Draft                                                 Cloudmark
Intended status: Informational                            April 10, 2012
Expires: October 12, 2012

               Resolution of The SPF/Sender-ID Experiment
                    draft-ietf-spfbis-experiment-01

Abstract

   In 2006 the IETF published a suite of protocol documents comprising
   SPF and Sender-ID, two proposed email authentication protocols.
   Because of interoperability concerns created by simultaneous use of
   the two protocols by a receiver, and some concerns with Sender-ID and
   compatibility with existing standards, the IESG required them to have
   Experimental status and invited the community to observe their
   deployments for a period of time, hoping convergence would be
   possible later.

   After six years, sufficient experience and evidence have been
   collected that the experiment thus created can be considered
   concluded, and a single protocol can be advanced.  This memo presents
   those findings.

Status of this Memo

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   This Internet-Draft will expire on October 12, 2012.

Copyright Notice

   Copyright (c) 2012 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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Internet-Draft          SPF/Sender-ID Experiment              April 2012

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  The Need For Consensus . . . . . . . . . . . . . . . . . . . .  3
   3.  Evidence of Deployment . . . . . . . . . . . . . . . . . . . .  4
   4.  Evidence of Differences  . . . . . . . . . . . . . . . . . . .  5
   5.  Conclusions  . . . . . . . . . . . . . . . . . . . . . . . . .  6
     5.1.  From the Evidence  . . . . . . . . . . . . . . . . . . . .  6
     5.2.  Recommendations to the IESG  . . . . . . . . . . . . . . .  7
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  7
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . .  7
   8.  Informative References . . . . . . . . . . . . . . . . . . . .  7
   Appendix A.  Experiences Developing SPF  . . . . . . . . . . . . .  8
   Appendix B.  Acknowledgments . . . . . . . . . . . . . . . . . . .  9
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 10

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1.  Introduction

   In April 2006, the IETF published the [SPF] and Sender-ID email
   authentication protocols, the latter consisting of three documents
   ([SUBMITTER], [SENDER-ID], and [PRA]).  Both of these enable one to
   publish via the Domain Name System a policy declaring which mail
   servers were authorized to send email on behalf of a specific domain
   name.  The two protocols made use of this policy statement and some
   specific (but different) logic to evaluate whether or not the email
   client sending or relaying a message was authorized to do so.

   Because Sender-ID supported use of the same policy statement as SPF,
   the IESG at the time was concerned that an implementation of
   Sender-ID might erroneously apply that statement to a message and,
   depending on selected recipient actions, could improperly interfere
   with message delivery.  As a result, the IESG required the
   publication of all of these documents as Experimental, and requested
   that the community observe deployment and operation of the protocols
   over a period of two years from publication in order to determine a
   reasonable path forward.  (For further details about the IESG's