EMAIL TOOLS
How secure is your email domain?
Check your domain’s email authentication and security settings, including SPF, DKIM, DMARC, and mail transport protections—all in one place.
Email security health check
Enter your email domain to check its public email security records. Identify potential authentication weaknesses, missing protections, and configurations that may need attention.
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These checks evaluate selected public DNS records. They do not verify real email messages, effective mail filtering, or the entire configuration of your email security service. Passing results are preliminary; TSN can investigate records that need review.
Uses a third-party public DNS resolver. DNS responses may be cached. The MTA-STS check examines DNS discovery only, not the HTTPS policy file. TLS reporting checks published DNS configuration, not whether reports are delivered. No records or security settings are modified.
Understand your results
SPF & Authorized Senders
SPF helps identify which servers are authorized to send email for your domain. Missing or incorrect records can contribute to spoofing risks and email delivery problems.
DKIM & DMARC Protection
DKIM helps verify that messages were signed by an authorized domain, while DMARC tells receiving servers how to handle messages that fail authentication checks.
Email Transport Security
MTA-STS and TLS reporting help improve visibility into secure email delivery. These protections can help identify encryption and mail transport configuration issues.