DNS · EMAIL · SECURITY DIAGNOSTICS
Expose configuration problems before attackers or mail filters do.
Professional DNS and email-security diagnostics with dedicated tools for SPF, DKIM, DMARC, headers, MX, transport security and more.
✓ SPF lookup limits✓ DMARC validation✓ Header forensics✓ Live DNS
SKULLCHECK TOOLBOX
Choose a dedicated tool
Each analyzer now opens on its own independent page with a permanent URL.
Domain Security ScoreWeighted DNS, email and transport security posture.OpenDNS LookupA, AAAA, MX, NS, TXT and CAA records.OpenSPF AnalyzerSyntax, recursive includes and DNS-query limit.OpenDKIM CheckerSelector, syntax and public key.OpenDMARC AnalyzerPolicy, alignment and reporting.OpenHeader AnalyzerParse Received hops and authentication.OpenMX HealthMail exchanger and reverse-DNS checks.OpenBlacklist CheckIndicative DNSBL checks.Open
ABOUT SKULLCHECK
DNS & email security diagnostics
SkullCheck provides focused diagnostic tools for domain administrators, email teams and security engineers. Check DNS records, validate SPF, DKIM and DMARC, inspect mail routing and transport security, analyze raw email headers, and review common domain-security signals from dedicated tool pages.
WHY SKULLCHECK
Technical depth, readable results.
SkullCheck turns raw DNS and mail-security data into pass, warning and error states with actionable explanations. Every diagnostic now has its own focused page instead of moving you around a single-page interface.
10SPF DNS-query ceiling monitored
13Dedicated diagnostic pages
0Accounts required