Email Tools
Email Security Summary
A combined overview of a domain's MX, SPF, DKIM, and DMARC configuration with an overall email security score.
Enter a domain for a combined overview of its MX, SPF, DKIM, and DMARC configuration, with an overall email security score.
JustChecker tracks your complete email security posture continuously and alerts you if anything regresses.
Frequently Asked Questions
It combines the presence and correct configuration of MX, SPF, DKIM, and DMARC into one overall picture - each missing or misconfigured piece reduces the score, since all four work together for genuinely secure, deliverable email.
Email authentication is inherently a combined system - SPF, DKIM, and DMARC specifically build on and reference each other, so a summary view surfaces gaps (like DMARC configured without underlying SPF/DKIM alignment) that checking each in isolation might miss.
Not necessarily - email can still function with an imperfect score, but each gap represents reduced protection against spoofing/phishing of your domain and, for some receiving servers, reduced deliverability confidence.
Missing or incomplete DMARC configuration is very common - many domains have basic SPF set up but never get around to adding DKIM and a DMARC policy, leaving meaningful gaps in their overall email authentication posture.
A sensible order is confirming MX works, then SPF, then DKIM, then DMARC last (since DMARC depends on the first two being correctly aligned) - trying to configure DMARC before SPF/DKIM are solid tends to cause more troubleshooting, not less.
No - it confirms your domain's authentication configuration is technically correct, but actual inbox placement also depends on sender reputation, content, and each receiving provider's own independent spam-filtering algorithms.