Free security checks for domains and mailboxes

Two practical checks. One serious security report.

Scan a domain for the hardening details attackers and auditors look at first. Then test whether your real emails authenticate and arrive cleanly. No account, no tracking, no paywall.

Domain security scan Start mail delivery test

◆Domain, server & DNS

Domain security scan

Complete external view of TLS/SSL, SSH, exposed ports, DNS, SPF, DKIM, DMARC, MTA-STS, HTTP security headers, WHOIS and PGP/WKD.

View public leaderboard

Do not publish this result on the leaderboard
Only applies to domains/websites. The target and grade will never appear on /leaderboard or be indexed by search engines.Run a fresh scan (ignore any cached result)
Repeated scans normally reuse the last saved result instead of scanning again.

By starting a scan you confirm you are only testing systems you are authorized to test.

✉Real inbox delivery

Email delivery test

Generate a one-time test address, send a message from your mailbox and see SPF, DKIM, DMARC, TLS, rDNS, spam signals and delivery details.

Start mail delivery test

Trust model

Built for operators, admins and small teams

Results stay usable without accounts or third-party cookies.
Detailed findings unlock only after domain proof-of-control.
Cached results keep repeated checks fast; fresh scans remain available.

Scope

What gets checked

TLS/SSLSSHPortsDNSSPF/DKIM/DMARCMTA-STSHTTP headersWHOIS