Email & Domain Security Tool Free Interactive Tool · Zero Logging

Free DMARC, SPF & MTA-STS Checker — Audit Domain Deliverability & Generate DNS Records

Audit MX, SPF, DMARC, DKIM & MTA-STS with a 0–100 score—or generate lookup-safe DNS TXT records. Free browser tool to audit any domain's MX, SPF, DMARC, DKIM, and MTA-STS records or generate RFC 7208 lookup-safe SPF and DMARC TXT records.

Interactive Edge Playground

Try It Live (`POST /v1/email-dns`)

Ready

Switch between Audit Domain DNS (powered by POST /v1/email-dns) and Generate DNS Records (powered by POST /v1/email-dns-generator). Edit the JSON payload or click a preset below and press Run Live Tool.

Input Payload (Editable JSON)

Live Edge Worker Output

{
  "ok": true,
  "data": {
    "domain": "cloudflare.com",
    "score": 95,
    "grade": "A",
    "checks": {
      "mx": {
        "status": "pass",
        "score": 20,
        "max_score": 20,
        "records": [
          "10 isaac.mx.cloudflare.net",
          "20 linda.mx.cloudflare.net"
        ],
        "issues": [],
        "fix": null
      },
      "spf": {
        "status": "pass",
        "score": 25,
        "max_score": 25,
        "records": [
          "v=spf1 ip4:199.15.212.0/22 include:_spf.google.com -all"
        ],
        "issues": [],
        "fix": null
      },
      "dmarc": {
        "status": "pass",
        "score": 25,
        "max_score": 25,
        "records": [
          "v=DMARC1; p=reject; sp=reject; pct=100; rua=mailto:dmarc@cloudflare.com"
        ],
        "issues": [],
        "fix": null
      },
      "dkim": {
        "status": "pass",
        "score": 20,
        "max_score": 20,
        "records": [
          "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A..."
        ],
        "issues": [],
        "fix": null,
        "found_selectors": [
          "cf2024-1"
        ],
        "checked_selectors": [
          "cf2024-1"
        ]
      },
      "mta_sts": {
        "status": "warn",
        "score": 5,
        "max_score": 10,
        "records": [
          "v=STSv1; id=20260101T000000Z"
        ],
        "issues": [],
        "fix": null
      }
    },
    "fixes": []
  },
  "meta": {
    "request_id": "req_edns_01",
    "ms": 42
  }
}

What This Free Tool Checks & Validates

Audits live MX, SPF (v=spf1), DMARC (_dmarc), DKIM selectors, and MTA-STS records via Cloudflare DoH
Flags RFC 7208 10-DNS-lookup limit risks, permissive +all/~all policies, and missing DMARC rua= tags
Generates ready-to-paste SPF, DMARC, TLS-RPT, and MTA-STS TXT records for 10+ major ESPs

Production API Integration

Automate This Check in Your Backend or CI/CD Pipeline

This browser tool runs on the exact same stateless Cloudflare Worker microservice as our production APIs. Subscribe on RapidAPI or Zyla API Hub to unlock up to 256 KB payloads and 500,000 monthly requests:

📧 POST /v1/email-dns Live on Hub