DMARC, which stands for “Domain-based Message Authentication, Reporting & Conformance”, is an email authentication, policy, and reporting protocol. It builds on the widely deployed SPF and DKIM protocols, adding linkage to the author (“From:”) domain name, published policies for recipient handling of authentication failures, and reporting from receivers to senders, to improve and monitor protection of the domain from fraudulent email.
DMARC specifications when implemented appropriately would enable organizations to reduce spam and phishing emails sent to their customers and employees from unauthorized senders and domains. It would enable fraud protection, simplified email delivery and domain reputation. In addition it will also benefit the domain management and compliance functions of the organization.