Domain-based Message Authentication Reporting Conformance (DMARC) (noun)
An open source email authentication protocol designed to prevent emails, spoofing in phishing, business email compromise or BEC, and other email-based attacks.
CyberWire Glossary link.
Audio reference link: "Global Cyber Alliance's Phil Reitinger talks DMARC adoption" “Global Cyber Alliance’s Phil Reitinger Talks DMARC Adoption.” YouTube Video. YouTube, April 27, 2018