Free Email Security Tools
Check and validate your domain's email authentication configuration. All tools are free, no account required.
DNS Record Checkers
Enter any domain to instantly check its email authentication records. Each tool validates the DNS configuration and reports issues with clear explanations.
DMARC Checker
Verify your DMARC record syntax, policy strength, alignment settings, and reporting configuration.
Check nowSPF Checker
Validate SPF records, count DNS lookups against the 10-lookup limit, and detect authorized email providers.
Check nowDKIM Checker
Verify DKIM keys across common selectors, check key strength, and detect weak 1024-bit keys.
Check nowMTA-STS Checker
Validate MTA-STS DNS records, HTTPS policy files, mode configuration, and MX record alignment.
Check nowBIMI Checker
Check BIMI records, logo availability and format, and VMC certificate authority.
Check nowTLS-RPT Checker
Validate TLS-RPT DNS records, reporting destinations, and STARTTLS support on your mail servers.
Check nowNeed 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.