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.
TLS-RPT Checker
Check that mail servers can report TLS delivery failures to you.
BIMI Checker
Check BIMI records, logo availability, and VMC certificates.
TLSA Record Generator
Generate DANE TLSA records from the certificate your mail servers actually serve.
DMARC Alignment Tester
Send a test email to verify SPF, DKIM, and DMARC alignment.
Need continuous monitoring?
These tools check once. MailShield rechecks all your domains every 2 hours, alerts you when something changes, and reads your DMARC reports for you. Free for 1 domain.