EMAIL & AUTHENTICATION ·
mta-sts:MTA-STS Check
Fetch and validate the MTA-STS DNS record and the HTTPS policy file.
About the MTA-STS Check tool
Fetch and validate the MTA-STS DNS record and the HTTPS policy file.
Tip: from any lookup box on the site you can type mta-sts:example.com to run this tool directly.
Results are generated live by querying the authoritative name servers of the domain, so changes you just published show up immediately. Each finding is graded as an error, warning or pass and explained so that you know what to fix and why it matters.