DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication policy that works with SPF and DKIM to prevent email spoofing. DMARC lets domain owners specify how receiving servers should handle emails that fail authentication (none, quarantine, or reject) and provides reporting on authentication results. Implementing DMARC is critical for protecting your domain's reputation and preventing phishing attacks using your domain.
FAQ
What is DMARC?
DMARC is an email policy that tells receiving servers what to do when emails from your domain fail SPF or DKIM checks — helping prevent phishing and spoofing.