The DMARC Lookup tool is designed to analyze and interpret the DMARC record for any specified domain. It displays the record and performs a comprehensive set of diagnostic checks to ensure everything is in order. DMARC, which stands for Domain-based Message Authentication, Reporting, and Conformance, is a system that allows email originators to define and communicate their domain-level policies. These policies cover message validation, handling, and reporting preferences.

DMARC records provide a standardized way for email senders to link domain identifiers with their messages, enforce policies based on these identifiers, and generate reports on email activity. As outlined in RFC 7489, DMARC enables strict management of emails that fail authentication checks like SPF and DKIM. If an email fails these checks, DMARC instructs the receiver on how to handle it—whether to quarantine the message or reject it outright.