Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
draft-ietf-spfbis-4408bis-16

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Network Working Group                                       S. Kitterman
Internet-Draft                              Kitterman Technical Services
Obsoletes: 4408 (if approved)                              June 29, 2013
Intended status: Standards Track
Expires: December 31, 2013

 Sender Policy Framework (SPF) for Authorizing Use of Domains in Email,
                               Version 1
                      draft-ietf-spfbis-4408bis-16

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 a ADMDs
   (ADministrative Management Domains) 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 December 31, 2013.

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   Copyright (c) 2013 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
   Provisions Relating to IETF Documents

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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.  Publishing Authorization . . . . . . . . . . . . . . . . .  8
     2.2.  Checking Authorization . . . . . . . . . . . . . . . . . .  8
     2.3.  The "HELO" Identity  . . . . . . . . . . . . . . . . . . .  9
     2.4.  The "MAIL FROM" Identity . . . . . . . . . . . . . . . . . 10
     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