MTA-STS checker
Inspect MTA-STS DNS and policy publication.
Inputs are sent to our server to run this check. They are not included in usage analytics.
Your result
Add your inputs, or try the example, to see your result here.
A policy check cannot test every sender's TLS negotiation.
How to use this tool
- Reads _mta-sts.domain and the HTTPS policy at mta-sts.domain.
What the result tells you
- A policy check cannot test every sender's TLS negotiation.