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MTA-STS Record and Policy Checker

Use this tool to check, lookup, and validate your MTA-STS record and policy and get configuration suggestions.

What is an MTA-STS Checker?

The tool checks if MTA-STS DNS record and policy files are published for your domain, and if they are deployed correctly. To run the MTA-STS Checker tool, enter the domain in the Domain section, and click the “Check MTA-STS” button. After that, the MTA-STS Checker tool will read the record and policy file, and will:

  • Check if MTA-STS TXT record is published in DNS for the domain
  • Verify if MTA-STS record's syntax corresponds to the specification
  • Check if the MTA-STS policy file is published at the specified URL
  • Validate the content of the policy and check it corresponds to specifications