DNS PREFLIGHT

Check before you send. Not after.

Audit PTR records, IP reputation, SPF, DKIM, and DMARC in seconds. No sending required. No signup. Nothing leaves your browser.

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What does DomainPreflight check?

DomainPreflight checks PTR/rDNS records, IP reputation against Spamhaus ZEN and SpamCop blocklists, SPF record validity and lookup count, DKIM key existence and strength, and DMARC policy level — before you send a single email.

How is this different from MXToolbox?

MXToolbox tells you what's wrong. DomainPreflight tells you exactly how to fix it, with copy-paste config for your specific setup. No account required.

Does anything leave my browser?

No. All checks use DNS-over-HTTPS queries made directly from your browser. No data is sent to any DomainPreflight server.