Domain-based Message Authentication, Reporting, and Conformance (DMARC)
draft-ietf-dmarc-dmarcbis-00
DMARC E. Gustafsson (ed)
Internet-Draft Google
Obsoletes: 7489 (if approved) T. Herr (ed)
Intended status: Standards Track Valimail
Expires: 14 May 2021 J. Levine (ed)
Standcore LLC
10 November 2020
Domain-based Message Authentication, Reporting, and Conformance (DMARC)
draft-ietf-dmarc-dmarcbis-00
Abstract
This document describes the Domain-based Message Authentication,
Reporting, and Conformance (DMARC) protocol.
DMARC is a scalable mechanism by which a mail-originating
organization can express domain-level policies and preferences for
message validation, disposition, and reporting. Mail-receiving
organizations can in turn use these expressions of policies and
preferences to inform their mail handling decisions should they
choose to do so.
This document obsoletes RFC 7489.
Status of This Memo
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This Internet-Draft will expire on 14 May 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Gustafsson (ed), et al. Expires 14 May 2021 [Page 1]
Internet-Draft DMARCbis November 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Requirements . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1. High-Level Goals . . . . . . . . . . . . . . . . . . . . 5
2.2. Out of Scope . . . . . . . . . . . . . . . . . . . . . . 5
2.3. Scalability . . . . . . . . . . . . . . . . . . . . . . . 6
2.4. Anti-Phishing . . . . . . . . . . . . . . . . . . . . . . 6
3. Terminology and Definitions . . . . . . . . . . . . . . . . . 6
3.1. Identifier Alignment . . . . . . . . . . . . . . . . . . 8
3.1.1. DKIM-Authenticated Identifiers . . . . . . . . . . . 9
3.1.2. SPF-Authenticated Identifiers . . . . . . . . . . . . 9
3.1.3. Alignment and Extension Technologies . . . . . . . . 10
3.2. Organizational Domain . . . . . . . . . . . . . . . . . . 10
4. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1. Authentication Mechanisms . . . . . . . . . . . . . . . . 11
4.2. Key Concepts . . . . . . . . . . . . . . . . . . . . . . 11
4.3. Flow Diagram . . . . . . . . . . . . . . . . . . . . . . 12
5. Use of RFC5322.From . . . . . . . . . . . . . . . . . . . . . 14
6. Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.1. DMARC Policy Record . . . . . . . . . . . . . . . . . . . 16
6.2. DMARC URIs . . . . . . . . . . . . . . . . . . . . . . . 16
6.3. General Record Format . . . . . . . . . . . . . . . . . . 17
6.4. Formal Definition . . . . . . . . . . . . . . . . . . . . 20
6.5. Domain Owner Actions . . . . . . . . . . . . . . . . . . 22
6.6. Mail Receiver Actions . . . . . . . . . . . . . . . . . . 22
6.6.1. Extract Author Domain . . . . . . . . . . . . . . . . 22
6.6.2. Determine Handling Policy . . . . . . . . . . . . . . 23
6.6.3. Policy Discovery . . . . . . . . . . . . . . . . . . 24
6.6.4. Message Sampling . . . . . . . . . . . . . . . . . . 26
6.6.5. Store Results of DMARC Processing . . . . . . . . . . 26
6.7. Policy Enforcement Considerations . . . . . . . . . . . . 26
7. DMARC Feedback . . . . . . . . . . . . . . . . . . . . . . . 28
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