DOMAIN SECURITY

Find Security Risks Hiding in Your Domain

DomainPreflight finds subdomain takeover risks, lookalike phishing domains, DMARC misconfigurations, and email authentication failures — all in your browser, no signup required.

Subdomain takeover detection Find dangling CNAMEs before attackers do Typosquat monitoring See which lookalike domains are already live
DMARC alignment engine Detect provider-specific alignment failures
DMARC report analyzer Paste XML — get instant visual breakdown
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Hit Run Preflight to see how your domain scores.
Checks
Actions
HOW TO USE
  1. Enter your domain and optional sending IP (for PTR and blocklist checks).
  2. Click Run Preflight.
  3. Review the score, check cards, and copy-paste fixes under Actions.
  4. Use Copy link to share this check.

What does DomainPreflight check?

Yes — PTR (who your IP claims to be), blocklists, SPF (who may send as your domain) and how many DNS hops that uses, DKIM keys, and DMARC policy. We run it all from your tab before you blast a campaign.

How is this different from MXToolbox?

MXToolbox lists errors. We try to hand you a fix you can paste — still free, still no account.

Does anything leave my browser?

No. Your browser talks DNS-over-HTTPS to resolvers. We don’t see your domain or IP on our servers.