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/dmarc-checker
DMARC Checker
Check whether a domain has a valid DMARC policy configured.
Try:
About DMARC Checker
DMARC Checker looks up a domain's DMARC policy and reports whether one is present, what enforcement level it is set to, and the raw record itself.
This matters beyond simply confirming a record exists, since a policy sitting at none only monitors mail without stopping anything, while quarantine and reject actually change what happens to mail that fails authentication. Use this to see a domain's real level of protection, not just whether DMARC has technically been switched on.
Run it after configuring DMARC for the first time, after tightening a policy from none to something stricter, or whenever checking how well a domain guards against being used in a spoofing attempt.
Tutorials
DMARC Policies ExplainedWhat a DMARC record actually controls, what none, quarantine and reject each do, and how to roll a policy out without breaking legitimate mail.6 min readWhy Email Spoofing Still Works Without SPF and DMARCWhy the openness of the original email protocol makes forgery possible by default, and exactly what each authentication check does and does not stop.6 min readSPF, DKIM and DMARC: How the Three Actually Fit TogetherThree separate email authentication mechanisms that only work as a system, and why checking just one of them tells an incomplete story.6 min read