This test will check a domain or hostname for an MTA-Strict Transport Security (MTA-STS) DNS TXT record and also for a valid MTA-STS Policy. When published, MTA-STS policies provide enhanced inbound protection for email being sent to your domain. This enhancement requires inbound mail being sent to your domain to be both authenticated (via proper Certificates) and encrypted (via TLS 1.2 or higher).

burritos@banana-pancakes.com braunstrowman@banana-pancakes.com finnbalor@banana-pancakes.com ricflair@banana-pancakes.com randysavage@banana-pancakes.com