The MTA-STS policy file is not valid.

MTASTS_INVALID_POLICY · Severity: Error

• ErrorMTASTS_INVALID_POLICY

  The MTA-STS policy file is not valid.

  The policy needs version: STSv1, a mode of enforce, testing or none, a max_age in seconds and at least one mx line unless the mode is none. Keys are case-sensitive. Senders treat an invalid policy as no policy.

  Recommendation: Correct the line shown in the evidence.

Reported by

• Domain health check
• MTA-STS and TLS-RPT check

Available through the API

• Domain health check API
• MTA-STS and TLS-RPT check API

Related findings

• Error MTASTS_INVALID_RECORD The MTA-STS record has invalid syntax.
• Warning MTASTS_LOW_MAX_AGE The MTA-STS policy has a max_age below one day.
• Info MTASTS_MODE_NONE The MTA-STS policy is in mode none.
• Warning MTASTS_MODE_TESTING The MTA-STS policy is in testing mode.
• Error MTASTS_MULTIPLE_RECORDS More than one MTA-STS record is published.
• Error MTASTS_MX_NOT_COVERED An MX host is not covered by the enforced MTA-STS policy.

All findings