DMARC Checker

The DMARC checker analyzes a domain's authentication setup by fetching DMARC, DKIM, and SPF records and evaluating alignment between the identified senders and the visible From address. It identifies whether a domain's policy is enforceable and whether legitimate mail passes authentication, helping operators reduce spoofing and improve deliverability.
Conceptually, the tool treats DMARC as the policy layer and treats SPF and DKIM as the mechanisms that supply authenticated identity. By comparing envelope-from and header-from domains and evaluating alignment (relaxed or strict), the tool reports a pass/fail for each mechanism and the overall stance.
Who benefits include domain owners, security teams, and managed service providers responsible for domain security and mail deliverability. Unique value lies in consolidated DNS-based checks, actionable recommendations, and an exportable data set for compliance or incident response. Core features include policy extraction, SPF and DKIM alignment checks, rua/ruf interpretation, and a clear, exportable summary for auditors.