Glossary: Security Monitoring and Automation

DMARC (Domain-based Message Authentication, Reporting and Conformance)

Also written: DMARC, dmarc=fail

An email check that confirms the visible From: domain matches a domain that passed SPF or DKIM, following that domain's published policy. It failed on the fake invoice because the From: domain was beansupply.example but the mail came from beansupp1y.example.