Resolution of The SPF/Sender-ID Experiment
draft-ietf-spfbis-experiment-05

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SPFBIS Working Group                                        M. Kucherawy
Internet-Draft                                                 Cloudmark
Intended status: Informational                            April 19, 2012
Expires: October 21, 2012

               Resolution of The SPF/Sender-ID Experiment
                    draft-ietf-spfbis-experiment-05

Abstract

   In 2006 the IETF published a suite of protocol documents comprising
   SPF and Sender-ID, two proposed email authentication protocols.
   Because of possible interoperability issues, particularly but not
   only those created by simultaneous use of the two protocols by a
   receiver, the IESG was unable to determine technical consensus and
   decided it was best to publish all of RFC4405, RFC4406, RFC4407 and
   RFC4408 as Experimental documents.  The IESG invited the community to
   observe their deployments for a period of time, and expressed hope
   for later convergence of opinion.

   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 document
   presents those findings.

Status of this Memo

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   This Internet-Draft will expire on October 21, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Kucherawy               Expires October 21, 2012                [Page 1]
Internet-Draft          SPF/Sender-ID Experiment              April 2012

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Evidence of Deployment . . . . . . . . . . . . . . . . . . . .  4
     3.1.  DNS Resource Record Types  . . . . . . . . . . . . . . . .  4
     3.2.  Implementations  . . . . . . . . . . . . . . . . . . . . .  5
     3.3.  The SUBMITTER SMTP Extension . . . . . . . . . . . . . . .  5
   4.  Evidence of Differences  . . . . . . . . . . . . . . . . . . .  6
   5.  Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   6.  Conclusions  . . . . . . . . . . . . . . . . . . . . . . . . .  7
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
   9.  Informative References . . . . . . . . . . . . . . . . . . . .  8
   Appendix A.  Experiences Developing SPF  . . . . . . . . . . . . .  9
   Appendix B.  Acknowledgments . . . . . . . . . . . . . . . . . . . 10
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 10

Kucherawy               Expires October 21, 2012                [Page 2]
Internet-Draft          SPF/Sender-ID Experiment              April 2012

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 protocols
   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
   the email client sending or relaying a message was authorized to do
   so.

   Due to the absence of consensus behind one or the other, and because
   Sender-ID supported use of the same policy statement defined by 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