Receivers Guidance for Implementing Branded Indicators for Message Identification (BIMI)
draft-brotman-ietf-bimi-guidance-02
Network Working Group A. Brotman
Internet-Draft Comcast
Intended status: Best Current Practice T. Zink
Expires: January 31, 2021 Zink Magical Contraptions
M. Bradshaw
Fastmail
July 30, 2020
Receivers Guidance for Implementing Branded Indicators for Message
Identification (BIMI)
draft-brotman-ietf-bimi-guidance-02
Abstract
This document is meant to assist receivers or other mailbox providers
by providing guidance to implementing Brand Indicators for Message
Identification (BIMI). This document is a companion to the main BIMI
drafts which should first be consulted and reviewed.
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 January 31, 2021.
Copyright Notice
Copyright (c) 2020 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
Brotman, et al. Expires January 31, 2021 [Page 1]
Internet-Draft BIMI-RG July 2020
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
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Goals for BIMI . . . . . . . . . . . . . . . . . . . . . . . 3
3. Should your site implement BIMI? . . . . . . . . . . . . . . 3
4. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
5. Site implementations . . . . . . . . . . . . . . . . . . . . 4
6. Validation of a BIMI message . . . . . . . . . . . . . . . . 5
6.1. BIMI Site Requirements . . . . . . . . . . . . . . . . . 5
6.2. Verified Mark Certificate (VMC) Validation . . . . . . . 6
7. Communicating BIMI results between the MTA and the MUA . . . 6
7.1. Image Retrieval . . . . . . . . . . . . . . . . . . . . . 6
7.2. TTL of cached images . . . . . . . . . . . . . . . . . . 7
7.3. Image Display . . . . . . . . . . . . . . . . . . . . . . 7
7.4. Privacy Concerns . . . . . . . . . . . . . . . . . . . . 7
7.5. Basic flow example . . . . . . . . . . . . . . . . . . . 8
7.6. Message Classification . . . . . . . . . . . . . . . . . 9
8. Domain Reputation . . . . . . . . . . . . . . . . . . . . . . 9
8.1. Rolling up based upon domain vs organizational domain . . 9
8.2. VMC Root of Trust . . . . . . . . . . . . . . . . . . . . 10
9. BIMI Playbook Checklist . . . . . . . . . . . . . . . . . . . 10
10. Public documentation . . . . . . . . . . . . . . . . . . . . 11
10.1. Documentation For Brands: . . . . . . . . . . . . . . . 11
10.2. Documentation For Users: . . . . . . . . . . . . . . . . 11
11. Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . 12
11.1. Glossary . . . . . . . . . . . . . . . . . . . . . . . . 12
12. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 13
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
14. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
14.1. Normative References . . . . . . . . . . . . . . . . . . 13
14.2. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction
The Brand Indicators for Message Identification (BIMI) specification
introduces a method by which Mail User Agent (MUA, e.g., an email
client) providers combine DMARC-based message authentication with
Show full document text