Resolution of The SPF and Sender ID Experiments
draft-ietf-spfbis-experiment-06

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SPFBIS Working Group                                        M. Kucherawy
Internet-Draft                                                 Cloudmark
Intended status: Informational                            April 24, 2012
Expires: October 26, 2012

            Resolution of The SPF and Sender ID Experiments
                    draft-ietf-spfbis-experiment-06

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 experiments thus created can be considered
   concluded.  This document presents those findings.

Status of this Memo

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   This Internet-Draft will expire on October 26, 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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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Evidence of Deployment . . . . . . . . . . . . . . . . . . . .  3
     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.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     9.1.  Normative References . . . . . . . . . . . . . . . . . . .  8
     9.2.  Informative References . . . . . . . . . . . . . . . . . .  8
   Appendix A.  Background on the RRTYPE Issue  . . . . . . . . . . .  9
   Appendix B.  Acknowledgments . . . . . . . . . . . . . . . . . . . 10
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 11

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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 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 same policy
   statement and some specific (but different) logic to evaluate whether
   the email client sending or relaying a message was authorized to do
   so.

   Consensus did not clearly support one protocol over the other, and
   there was significant concern that the two would conflict in some
   significant operational situations, interfering with message
   delivery.  The IESG required the publication of all of these