Sendmarc by Sendmarc is a DMARC (Domain-based Message Authentication, Reporting and Conformance) management platform that implements and controls email authentication protocols including SPF, DKIM, and DMARC. The solution enables domain owners to manage email authentication policies, monitor email sending activities, and protect domains against email impersonation, phishing, and spoofing attacks. It operates by adding TXT records to the DNS of email domains to specify handling instructions for messages, validates email origins through SPF checks, verifies message integrity via DKIM signatures, and enforces DMARC policies for authentication failures. The platform provides continuous monitoring of email authentication protocols, consolidated DMARC reporting and analytics, and real-time threat intelligence capabilities while ensuring compliance with industry regulations such as Google and Yahoo sender rules, PCI DSS, NIST, and CCPA.