DMARC
DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol that builds on SPF and DKIM to allow domain owners to specify how email from their domain should be handled if it fails authentication checks. It provides a policy framework for receivers to determine what to do with unauthenticated emails (e.g., reject or quarantine) and sends reports back to domain owners about authentication results. This helps prevent email spoofing and phishing attacks by improving email deliverability and security.
Developers should learn DMARC when working on email systems, security implementations, or applications that send transactional or marketing emails to ensure legitimate emails are delivered and malicious ones are blocked. It's crucial for organizations to protect their domain reputation, comply with email security standards, and reduce the risk of phishing attacks targeting their users. Use cases include setting up email authentication for web applications, configuring email servers, and implementing security measures for cloud-based email services.