DMARC (Domain-based Message Authentication, Reporting and Conformance) is an email authentication protocol that is used to protect against email spoofing and phishing attacks. It allows email domain owners to specify which servers are allowed to send emails on behalf of their domain, thereby increasing the level of security and trust for email recipients. DMARC combines the authentication mechanisms of two other protocols, SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail), and provides reporting to help domain owners understand how their emails are being handled by receiving mail servers.
