Brand Indicators for Message Identification (BIMI)
draft-blank-ietf-bimi-00

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Network Working Group                                           S. Blank
Internet-Draft                                              P. Goldstein
Intended status: Experimental                                   Valimail
Expires: August 10, 2019                                   T. Loder, Ed.
                                                         Skye Logicworks
                                                            T. Zink, Ed.
                                                       February 06, 2019

           Brand Indicators for Message Identification (BIMI)
                        draft-blank-ietf-bimi-00

Abstract

   Brand Indicators for Message Identification (BIMI) permits Domain
   Owners to coordinate with Mail User Agents (MUAs) to display brand-
   specific Indicators next to properly authenticated messages.  There
   are two aspects of BIMI coordination: a scalable mechanism for Domain
   Owners to publish their desired indicators, and a mechanism for Mail
   Transfer Agents (MTAs) to verify the authenticity of the indicator.
   This document specifies how Domain Owners communicate their desired
   indicators through the BIMI assertion record in DNS and how that
   record is to be handled by MTAs and MUAs.  The domain verification
   mechanism and extensions for other mail protocols (IMAP, etc.) are
   specified in separate documents.  MUAs and mail-receiving
   organizations are free to define their own policies for indicator
   display that makes use or not of BIMI data as they see fit.

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 10, 2019.

Blank, et al.            Expires August 10, 2019                [Page 1]
Internet-DraftBrand Indicators for Message Identification (February 2019

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  High-Level Goals  . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Security  . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.3.  Out of Scope  . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Terminology and Definitions . . . . . . . . . . . . . . . . .   7
     4.1.  BIMI Assertion  . . . . . . . . . . . . . . . . . . . . .   8
     4.2.  Indicator . . . . . . . . . . . . . . . . . . . . . . . .   8
     4.3.  Mark Verifying Authority (MVA)  . . . . . . . . . . . . .   8
     4.4.  Mark Verified Certificate (MVC) . . . . . . . . . . . . .   8
     4.5.  Protocol Client . . . . . . . . . . . . . . . . . . . . .   8
     4.6.  Verifying Protocol Client . . . . . . . . . . . . . . . .   8
   5.  BIMI DNS Records  . . . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Assertion Record  . . . . . . . . . . . . . . . . . . . .   9
       5.1.1.  Declination to publish  . . . . . . . . . . . . . . .  11
       5.1.2.  Supported Image Formats for l= tag  . . . . . . . . .  11
     5.2.  Selectors . . . . . . . . . . . . . . . . . . . . . . . .  11
   6.  BIMI Header Fields  . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  BIMI-Selector . . . . . . . . . . . . . . . . . . . . . .  12
     6.2.  BIMI-Location . . . . . . . . . . . . . . . . . . . . . .  13
     6.3.  Header Signing  . . . . . . . . . . . . . . . . . . . . .  14
   7.  Domain Owner Actions  . . . . . . . . . . . . . . . . . . . .  14
     7.1.  Determine and publish Indicator(s) for use  . . . . . . .  14
     7.2.  Specify Domain Owner Preference . . . . . . . . . . . . .  14
     7.3.  Publish Assertion Records . . . . . . . . . . . . . . . .  14