Free MTA-STS Validator & Policy File Checker
Instantly test & plan your domain's MTA-STS policy file, DNS TXT record, and TLS-RPT configuration to ensure your email traffic is protected from man-in-the-middle attacks.
MTA-STS (Mail Transfer Agent Strict Transport Security) helps secure your organisation's email traffic by enforcing encrypted delivery between sending and receiving servers.
This free MTA-STS validator checks your MTA-STS configuration including policy file and DNS TXT record. It produces an easy to follow plan to help you implement MTA-STS.
Proper setup of MTA-STS and TLS reporting (TLS-RPT) protects organisations from email interception and spoofing attempts while maintaining compliance with modern email security standards.
Enter Domain to Test
Enter your domain name to check its MTA-STS configuration and get implementation guidance.