E-mail Authentication for Internationalized Mail
draft-ietf-dmarc-eaiauth-06

Document Type Active Internet-Draft (dmarc WG)
Last updated 2019-04-24 (latest revision 2019-04-11)
Replaces draft-levine-appsarea-eaiauth
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication
Document shepherd Kurt Andersen
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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)                   April 11, 2019
Intended status: Standards Track
Expires: October 13, 2019

            E-mail Authentication for Internationalized Mail
                      draft-ietf-dmarc-eaiauth-06

Abstract

   SPF (RFC7208), DKIM (RFC6376), and DMARC (RFC7489) 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.  This specification updates the SPF, DKIM, and
   DMARC specifications to clarify which form of internationalized
   domain names to use in those specifications.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 October 13, 2019.

Copyright Notice

   Copyright (c) 2019 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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

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   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  . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Appendix A.  Change history . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   SPF [RFC7208], DKIM [RFC6376], and DMARC [RFC7489] 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 field 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 message header fields, in SMTP sessions, and in the DNS.

   Internationalized mail [RFC6530], (generally called EAI for E-mail
   Address Internationalization), allows U-labels in SMTP sessions
   [RFC6531] and in message header fields [RFC6532].

   Every U-label is equivalent to an A-label, so in principle the choice
   of label format will not cause 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 UTF-8 encoded Unicode characters
   in the local parts of mailbox names, which were historically only
   ASCII.

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2.  Definitions

   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 BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
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