Resolution of The SPF and Sender ID Experiments
draft-ietf-spfbis-experiment-08

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SPFBIS Working Group                                        M. Kucherawy
Internet-Draft                                                 Cloudmark
Intended status: Informational                              May 10, 2012
Expires: November 11, 2012

            Resolution of The SPF and Sender ID Experiments
                    draft-ietf-spfbis-experiment-08

Abstract

   In 2006 the IETF published a suite of protocol documents comprising
   SPF and Sender ID, two proposed email authentication protocols.  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 the domain name being queried.  There was concern that the
   two would conflict in some significant operational situations,
   interfering with message delivery.

   The IESG required the publication of all of these documents (RFC4405,
   RFC4406, RFC4407, and RFC4408) with Experimental status, and
   requested that the community observe deployment and operation of the
   protocols over a period of two years from the date of publication to
   determine a reasonable path forward.

   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 November 11, 2012.

Copyright Notice

Kucherawy               Expires November 11, 2012               [Page 1]
Internet-Draft          SPF/Sender ID Experiments               May 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  . . . . . . . . . . . . . . . . . . .  7
   5.  Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
   6.  Conclusions  . . . . . . . . . . . . . . . . . . . . . . . . .  8
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     9.1.  Normative References . . . . . . . . . . . . . . . . . . .  9
     9.2.  Informative References . . . . . . . . . . . . . . . . . .  9
   Appendix A.  Background on the RRTYPE Issue  . . . . . . . . . . . 10
   Appendix B.  Acknowledgments . . . . . . . . . . . . . . . . . . . 11
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 12

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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 are authorized to send email on behalf of the
   selected domain name.  There was concern that the two would conflict
   in some significant operational situations, interfering with message
   delivery.

   Consensus did not clearly support one protocol over the other, and
   there was significant concern that the two would conflict in some