Free tools
Domain Health Checker
Scan DNS, TLS, email authentication, and security headers for a public domain.
This scan checks
DNS
TLS
Email auth
Headers
What the free result includes
Use the checker to catch obvious domain configuration risks before they affect SEO, deliverability, or trust.
Weighted domain health score from 0 to 100.
Pass counts across DNS, email authentication, TLS, and headers.
The worst failing check with a plain-language recommendation.