With this tool you can inspect and validate an MTA-STS policy and DNS record. We'll test the policy and record against all requirements from the MTA-STS standard RFC8461
Just enter your domain name below and press the inspect button.
We will test the DNS record at
_mta-sts.[your-domain] and the policy file at
Mailhardener offers hosted MTA-STS, which will allow you to adopt MTA-STS for your domain in less than a minute. It's completely maintenance free. Mailhardener hosted MTA-STS comes included for free in every paid tier.