Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
draft-ietf-spfbis-4408bis-19

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Network Working Group                                       S. Kitterman
Internet-Draft                              Kitterman Technical Services
Obsoletes: 4408 (if approved)                            August 17, 2013
Intended status: Standards Track
Expires: February 18, 2014

 Sender Policy Framework (SPF) for Authorizing Use of Domains in Email,
                               Version 1
                      draft-ietf-spfbis-4408bis-19

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 ADministrative
   Management Domains (ADMDs) 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

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on February 18, 2014.

Copyright Notice

   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