Compare/email.deliverability

Email authentication audit

SPF, DKIM, DMARC, MX, BIMI and MTA-STS checks for a sending domain, with fixes. 1 live · 1 in the catalog.

At a glance

1 of 1 provider for Email authentication audit on Superpowers can serve a call right now: Superpowers email authentication audit. Superpowers email authentication audit is free with any Superpowers account. Over the last 30 days Superpowers email authentication audit averaged 240ms across 4 calls, with 100% succeeding. Call it with one API key: POST /v1/run with "tool": "emailauth.audit", or through the MCP server. Every provider takes the same input and returns the same output, and failed calls are not charged.

Provider	Price	Success	Speed	Status
Audit a domain's email authenticationSuperpowers email authentication audit	Free	100%	240ms	Live

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Pick up to 6 live providers. Each one is charged at its own price; failures are free.

Shared format

Input

{
  "type": "object",
  "additionalProperties": false,
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "minLength": 3,
      "maxLength": 253,
      "description": "Sending domain, e.g. nubank.com.br (no scheme or path)"
    },
    "dkim_selectors": {
      "type": "array",
      "maxItems": 10,
      "items": {
        "type": "string",
        "pattern": "^[A-Za-z0-9._-]{1,63}$"
      },
      "description": "Extra DKIM selectors to check, e.g. the one your email platform gave you"
    }
  }
}

Normalized output

{
  "score": 0,
  "issues": [
    {
      "severity": "",
      "check": "",
      "fix": ""
    }
  ],
  "spf": {
    "record": "",
    "lookups": 0
  },
  "dmarc": {
    "policy": ""
  },
  "dkim": {
    "found": [
      ""
    ]
  }
}

Questions

Which Email authentication audit API is cheapest?

Superpowers email authentication audit is free with any Superpowers account.

Which Email authentication audit API is fastest?

Over the last 30 days Superpowers email authentication audit averaged 240ms across 4 calls, with 100% succeeding.

Is there a free Email authentication audit API?

Yes. Superpowers email authentication audit is free with any Superpowers account; you only need a key.

How do I call a Email authentication audit API from an AI agent?

Call it with one API key: POST /v1/run with "tool": "emailauth.audit", or through the MCP server. Every provider takes the same input and returns the same output, and failed calls are not charged. New accounts get $5 free; see /docs for the MCP setup.