email-toolbox-wiki/DMARC-how-to.md

Table of contents

Introduction

This how-to is created by the Dutch Internet Standards Platform (the organization behind internet.nl) and is meant to provide practical information and guidance on implementing DMARC.

What is DMARC?

DMARC is short for Domain based Message Authentication, Reporting and Conformance and is described in RFC 7489. With DMARC the owner of a domain can, by means of a DNS record, publish a policy that states how to handle e-mail which is not properly authenticated using SPF and/or DKIM. At the same time it provides the means for receiving reports which allows a domain's administrator to detect whether their domainname is used for phishing or spam.

Why use DMARC?

to-do.

Tips, tricks and notices for implementation

• Interoperabily issues: https://tools.ietf.org/html/rfc7960
• DMARC does not require both DKIM or SPF.