What is DMARC?

DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email authentication protocol. It is designed to give email domain owners the ability to protect their domain from unauthorized use, commonly known as email spoofing. DMARC allows domain owners to indicate that their emails are protected by SPF and DKIM, and tells receiving mail servers what to do if an email fails those authentication checks (e.g., reject the message, quarantine it, or do nothing). It also provides a reporting mechanism for domain owners to receive feedback about email authentication results, enabling them to identify and address potential issues.