Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
draft-ietf-spfbis-4408bis-13

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Network Working Group                                       S. Kitterman
Internet-Draft                              Kitterman Technical Services
Obsoletes: 4408 (if approved)                             March 25, 2013
Intended status: Standards Track
Expires: September 26, 2013

 Sender Policy Framework (SPF) for Authorizing Use of Domains in Email,
                               Version 1
                    draft-ietf-spfbis-4408bis-13.txt

Abstract

   Email on the Internet can be forged in a number of ways.  In
   particular, existing protocols place no restriction on what a sending
   host can use as the "MAIL FROM" of a message or the domain given on
   the SMTP HELO/EHLO commands.  This document describes version 1 of
   the Sender Policy Framework (SPF) protocol, whereby an ADMD can
   explicitly authorize the hosts that are allowed to use its domain
   names, and a receiving host can check such authorization.

   This document obsoletes RFC4408.

Status of this Memo

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   This Internet-Draft will expire on September 26, 2013.

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   Copyright (c) 2013 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  6
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  6
       1.1.1.  Keywords . . . . . . . . . . . . . . . . . . . . . . .  6
       1.1.2.  Imported Definitions . . . . . . . . . . . . . . . . .  6
       1.1.3.  MAIL FROM Definition . . . . . . . . . . . . . . . . .  7
       1.1.4.  HELO Definition  . . . . . . . . . . . . . . . . . . .  7
     1.2.  check_host() . . . . . . . . . . . . . . . . . . . . . . .  7
   2.  Operational Overview . . . . . . . . . . . . . . . . . . . . .  8
     2.1.  The "HELO" Identity  . . . . . . . . . . . . . . . . . . .  8
     2.2.  The "MAIL FROM" Identity . . . . . . . . . . . . . . . . .  8
     2.3.  Publishing Authorization . . . . . . . . . . . . . . . . .  8
     2.4.  Checking Authorization . . . . . . . . . . . . . . . . . .  9
     2.5.  Location of Checks . . . . . . . . . . . . . . . . . . . . 10
     2.6.  Results of Evaluation  . . . . . . . . . . . . . . . . . . 10
       2.6.1.  None . . . . . . . . . . . . . . . . . . . . . . . . . 11
       2.6.2.  Neutral  . . . . . . . . . . . . . . . . . . . . . . . 11
       2.6.3.  Pass . . . . . . . . . . . . . . . . . . . . . . . . . 11
       2.6.4.  Fail . . . . . . . . . . . . . . . . . . . . . . . . . 11
       2.6.5.  Softfail . . . . . . . . . . . . . . . . . . . . . . . 11
       2.6.6.  Temperror  . . . . . . . . . . . . . . . . . . . . . . 11
       2.6.7.  Permerror  . . . . . . . . . . . . . . . . . . . . . . 11
   3.  SPF Records  . . . . . . . . . . . . . . . . . . . . . . . . . 12