Glossary/Email & Lifecycle/DMARC
Email & Lifecycle
DMARC
A DNS policy built on SPF and DKIM telling receivers how to handle failing emails (none, quarantine or reject) and sending reports.
By Brandon Mina·CEO, BrandPilot AI·Updated November 2026
Short answer
DMARC (Domain-based Message Authentication, Reporting and Conformance) is a DNS policy that tells receiving mail servers how to handle messages failing SPF and DKIM checks: none, quarantine, or reject. It also sends reports to the domain owner. DMARC helps prevent spoofing and is now required by major mailbox providers for bulk senders.