What is Domain-based Message Authentication, Reporting, and Conformance (DMARC)?
Domain-based Message Authentication, Reporting, and Conformance (DMARC) is an email authentication protocol that builds on the widely used SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) protocols. DMARC helps email domain owners protect their domain from being used in phishing and other malicious activities. It provides a way for email senders to specify how unauthenticated messages should be handled by receiving mail servers.