DMARC is an email validation system designed to uncover anyone using your domain without authorization, and ultimately block delivery of all unauthenticated mail. It builds on existing SPF and DKIM authentication techniques by adding a critical element, reporting. DMARC reports provide detailed information about who is sending email using your domains. Using this information, you can specify what to do when emails fail DMARC authentication checks. Put a stop to fraudulent senders with complete visibility into who is sending mail on your behalf and chose Mimecast DMARC Analyzer.