E-mail Authentication for Internationalized Mail
draft-levine-appsarea-eaiauth-05

Document Type Active Internet-Draft (individual in art area)
Last updated 2018-10-27 (latest revision 2018-07-31)
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication (wg milestone: Jan 2019 - Complete EAI update ... )
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IESG IESG state Publication Requested
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Responsible AD Alexey Melnikov
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Network Working Group                                          J. Levine
Internet-Draft                                      Taughannock Networks
Updates: 6376, 7208, 7489 (if approved)                    July 31, 2018
Intended status: Standards Track
Expires: February 1, 2019

            E-mail Authentication for Internationalized Mail
                    draft-levine-appsarea-eaiauth-05

Abstract

   SPF, DKIM, and DMARC enable a domain owner to publish e-mail
   authentication and policy information in the DNS.  In
   internationalized e-mail, domain names can occur both as U-labels and
   A-labels.  The Authentication-Results header reports the result of
   authentication checks made with SPF, DKIM, DMARC, and other schemes.
   This specification clarifies when to use which form of domain names
   when using SPF, DKIM, and DMARC and when creating Authentication-
   Results headers.

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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   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 1, 2019.

Copyright Notice

   Copyright (c) 2018 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
   (https://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

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   to this document.  Code Components extracted from this document must
   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  General principles  . . . . . . . . . . . . . . . . . . . . .   3
   4.  SPF and internationalized mail  . . . . . . . . . . . . . . .   3
   5.  DKIM and internationalized mail . . . . . . . . . . . . . . .   4
   6.  DMARC and internationalized mail  . . . . . . . . . . . . . .   4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Appendix A.  Change history . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   SPF, DKIM, and DMARC enable a domain owner to publish e-mail
   authentication and policy information in the DNS.  SPF primarily
   publishes information about what host addresses are authorized to
   send mail for a domain.  DKIM places cryptographic signatures on
   e-mail messages, with the validation keys published in the DNS.
   DMARC publishes policy information related to the domain in the From:
   header of e-mail messages.

   In conventional e-mail, all domain names are ASCII in all contexts so
   there is no question about the representation of the domain names.
   All internationalized domain names are represented as A-labels
   [RFC5890] in unencoded message bodies, in SMTP sessions, and in the
   DNS.  Internationalized mail [RFC6530] allows U-labels in SMTP
   sessions [RFC6531] and in message headers [RFC6532].

   Every U-label is equivalent to an A-label, so in principle the choice
   of label format should not cause any ambiguities.  But in practice,
   consistent use of label formats will make it more likely that mail
   senders' and receivers' code interoperates.

   Internationalized mail also allows arbitrary UTF-8 strings in the
   local parts of mailbox names, which were historically arbitrary
   ASCII.

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2.  Definitions

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

   The term IDN, for Internationalized Domain Name, refers to a doman
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