Domain-based Message Authentication, Reporting, and Conformance, or DMARC, is a policy framework that allows email domain owners to protect their domain from unauthorized use. It builds on both SPF and DKIM to provide domain owners with better control over how their emails are authenticated and how to handle failed authentication attempts. DMARC allows domain owners to set policies that specify what action should be taken when an email fails SPF or DKIM checks. For example, the domain owner can instruct the recipient’s email server to either quarantine the email (send it to spam), reject it, or accept it with caution. Additionally, DMARC enables domain owners to receive detailed reports on email authentication activity, helping them monitor the usage of their domain and detect potential phishing attacks or other malicious activities. DMARC provides a way to enforce a consistent email authentication policy, increase email security, and improve overall trust in email communication.