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MTA-STS validator

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 DKIM standard RFC8461

Note: If you use MTA-STS, you should also use TLS reporting (TLS-RPT), we have a validator for TLS-RPT here.

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 https://mta-sts.[yourdomain]/.well-known/mta-sts.txt.

Mailhardener hosted MTA-STS

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.

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