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MTA-STS Generator

Generate the MTA-STS DNS record and policy file.

Start in testing with TLS-RPT, then switch to enforce.
Leave empty to use the domain's current MX records.
604800 = 1 week (testing), 2592000 = 30 days (enforce).

About the MTA-STS Generator tool

Generate the MTA-STS DNS record and policy file.

Results are generated live. Each finding is graded as an error, warning or pass and explained so that you know what to fix and why it matters.

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Get alerted when this check starts failing, when you land on a blacklist or when a certificate or domain is about to expire.

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