E-mail Authentication for Internationalized Mail
draft-ietf-dmarc-eaiauth-03

Document Type Active Internet-Draft (dmarc WG)
Last updated 2019-03-14 (latest revision 2019-02-27)
Replaces draft-levine-appsarea-eaiauth
Stream IETF
Intended RFC status Proposed Standard
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Kurt Andersen
Shepherd write-up Show (last changed 2019-02-26)
IESG IESG state Waiting for Writeup
Consensus Boilerplate Yes
Telechat date On agenda of 2019-04-11 IESG telechat
Responsible AD Alexey Melnikov
Send notices to (None)
IANA IANA review state IANA OK - No Actions Needed
IANA action state None
Network Working Group                                          J. Levine
Internet-Draft                                      Taughannock Networks
Updates: 6376, 7208, 7489 (if approved)                February 27, 2019
Intended status: Standards Track
Expires: August 31, 2019

            E-mail Authentication for Internationalized Mail
                      draft-ietf-dmarc-eaiauth-03

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.  The Authentication-Results header reports the
   result of authentication checks made with SPF, DKIM, DMARC, and other
   schemes.  This specification updates the SPF, DKIM, and DMARC
   specifications to clarify which form of internationalized domain
   names to use in those specifications, 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
   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 August 31, 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

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   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
   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 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 UTF-8 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
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