Free Email Security Tools
Check your domain's email authentication configuration instantly. No account required.
SPF Checker
Validate SPF records, count DNS lookups, and detect email providers.
DMARC Checker
Check DMARC records, policies, and reporting configuration.
DKIM Checker
Verify DKIM keys across common selectors and check key strength.
MTA-STS Checker
Validate MTA-STS DNS records and HTTPS policy files.
BIMI Checker
Check BIMI records, logo availability, and VMC certificates.
DMARC Alignment Checker
Send a test email to verify SPF, DKIM, and DMARC alignment.
Need continuous monitoring?
These tools give you a one-time check. For 24/7 monitoring with alerts, DMARC report processing, and security scoring across all your domains, sign up for MailShield. Free for up to 2 domains.