DMARC Checker
Validate a domain's DMARC record, policy and reporting, with issues flagged.
DMARC tells inbox providers what to do with mail that fails SPF and DKIM alignment, and where to send authentication reports. No signup required.
How to use the DMARC Checker
- Enter the domain you want to check (for example, example.com).
- We look up the live DMARC record at _dmarc.yourdomain and validate it.
- Review the policy, reporting addresses and any flagged issues.
Frequently asked questions
DMARC is a DNS TXT record at _dmarc.yourdomain that tells inbox providers what to do with mail that fails SPF and DKIM alignment, and where to send authentication reports.
The policy tag controls enforcement. p=none only monitors, p=quarantine sends failing mail to spam, and p=reject blocks it outright. Most domains start at none and tighten as they gain confidence.
The rua tag points to a mailbox that receives aggregate reports. Without it you get no visibility into who is sending as your domain or whether your authentication is aligned.
Monitor this automatically
DeliverSignal runs these checks daily and alerts you when something breaks.
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