Free MTA-STS Record Checker
Verify your Mail Transfer Agent Strict Transport Security (MTA-STS) configuration to prevent man-in-the-middle attacks.
Frequently Asked Questions
What is MTA-STS?
MTA-STS (Mail Transfer Agent Strict Transport Security) is a protocol that forces emails to be sent over a secure TLS connection, preventing man-in-the-middle attacks.
How does MTA-STS work?
It uses a DNS record to signal that the domain supports MTA-STS and an HTTPS policy file to specify the enforcement policy.
Do I need MTA-STS?
Yes, strict MTA-STS helps ensure that your emails are not intercepted or read by unauthorized parties during transit.