check_mta_sts

Active

declared in 3.29.5

Check whether a domain enforces SMTP TLS for inbound mail via MTA-STS, protecting against downgrade attacks. Queries _mta-sts.<domain> and fetches the policy file, reports mode (enforce/testing/none) and MX coverage. Use to verify whether inbound SMTP is protected against TLS downgrade or MITM — distinct from check_dane which uses TLSA pinning. Part of the scan_domain audit.

Parameters schema

{
  "type": "object",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "maxLength": 253,
      "minLength": 1,
      "description": "Domain to check (e.g., example.com)"
    },
    "format": {
      "enum": [
        "full",
        "compact"
      ],
      "type": "string",
      "description": "Output verbosity. Auto-detected if omitted."
    },
    "force_refresh": {
      "type": "boolean",
      "description": "Bypass cache and run a fresh check. Useful after DNS changes."
    }
  }
}

What this tool wraps· 0 endpoints

min confidence0.70 0.50

No endpoints wrapped at confidence ≥ 0.70.

Parent server

com.blackveilsecurity/dns

https://github.com/MadaBurns/bv-mcp

2/7 registries

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