Email Authentication Status Codes
draft-ietf-appsawg-email-auth-codes-06

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Network Working Group                                       M. Kucherawy
Internet-Draft                                            August 5, 2014
Updates: 7208 (if approved)
Intended status: Standards Track
Expires: February 6, 2015

                   Email Authentication Status Codes
                 draft-ietf-appsawg-email-auth-codes-06

Abstract

   This document registers code points to allow status codes to be
   returned to an email client to indicate that a message is being
   rejected or deferred specifically because of email authentication
   failures.

   This document updates [RFC7208] since some of the code points
   registered replace the ones recommended for use in that document.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on February 6, 2015.

Copyright Notice

   Copyright (c) 2014 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Key Words . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  New Enhanced Status Codes . . . . . . . . . . . . . . . . . . . 3
     3.1.  DKIM Failure Codes  . . . . . . . . . . . . . . . . . . . . 3
     3.2.  SPF Failure Codes . . . . . . . . . . . . . . . . . . . . . 4
     3.3.  Reverse DNS Failure Code  . . . . . . . . . . . . . . . . . 5
     3.4.  Multiple Authentication Failures Code . . . . . . . . . . . 5
   4.  General Considerations  . . . . . . . . . . . . . . . . . . . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
   7.  Normative References  . . . . . . . . . . . . . . . . . . . . . 7
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . . . 7

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1.  Introduction

   [RFC3463] introduced Enhanced Mail System Status Codes, and [RFC5248]
   created an IANA registry for these.

   [RFC6376] and [RFC7208] introduced, respectively, DomainKeys
   Identified Mail (DKIM) and Sender Policy Framework (SPF), two
   protocols for conducting message authentication.  Another common
   email acceptance test is the reverse Domain Name System (DNS) check
   on an email client's IP address, as described in Section 3 of
   [RFC7001].

   The current set of enhanced status codes does not include any code
   for indicating that a message is being rejected or deferred due to
   local policy reasons related to any of these mechanisms.  This is
   potentially useful information to agents that need more than
   rudimentary handling information about the reason a message was
   rejected on receipt.  This document introduces enhanced status codes
   for reporting those cases to clients.

   Section 3.2 updates [RFC7208], as new enhanced status codes relevant
   to that specification are being registered and recommended for use.

2.  Key Words

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   [RFC2119].

3.  New Enhanced Status Codes

   The following new enhanced status codes are defined:

3.1.  DKIM Failure Codes

   In the code point definitions below, the term "acceptable" means both
   of the following:

   a.  The signature passed the basic DKIM verification algorithm as
       defined in [RFC6376]; and

   b.  The signature satisfied any local policy requirements in addition