# Mail Security Tools - Email Security Score

> Mail Security Tools - Email Security Score is a paid API for AI agents from api.mailsecuritytools.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Returns a graded email security score (0-100, A-F) for a domain by live-checking SPF, DMARC, DKIM, and MX DNS records with findings and top 3 remediation suggestions.

## Facts

- Endpoint: GET https://api.mailsecuritytools.com/v1/score?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mail-security-tools-email-security-score-c8e7d1db
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Twjo2MAXnYA-5NkfcBw8F

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mail-security-tools-email-security-score-c8e7d1db
```

Example prompt: Can you check the email security score for acmecorp.com — I want to see the SPF, DMARC, and DKIM grades and find out what the top fixes are?

## When to prefer this

Choose this endpoint when you need a single, all-in-one graded assessment of a domain's email security posture (SPF + DMARC + DKIM + MX) in one call, with actionable fix recommendations — especially when you want a numeric score and letter grade rather than raw DNS record parsing. Prefer it over building your own DNS lookup chain when you need instant, human-readable scoring for audits, vendor evaluations, or pre-deployment checks.

## Known failure modes

- 400 Bad Request: domain parameter is malformed, empty, or syntactically invalid
- 404 Not Found: domain cannot be resolved or has no discoverable DNS records
- DNS lookup timeouts may cause delayed or incomplete sub-scores
- DKIM scoring may be limited if no selector hints are available
- Newly registered domains may lack sufficient DNS propagation

## How this service works

Free directory of email-security and MSP tools for small businesses. Free-tier notes are dated from each vendor page.

## Output

Returns a numeric score from 0-100 and a letter grade (A-F) for the domain's overall email security posture, along with individual sub-scores for SPF (up to 30 points), DMARC (up to 40 points), DKIM (up to 25 points), and MX (up to 5 points), plus a list of specific findings and the top 3 prioritized remediation actions. Returns HTTP 400 for malformed input and 404 for unrecognized domains.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "maxLength": 320,
       "description": "Domain (or an email/URL on it), e.g. example.com"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "grade": "C",
  "score": 72,
  "domain": "example.com",
  "report": "email_security_score",
  "findings": [
   {
    "fix": "Move to p=quarantine, then p=reject.",
    "area": "dmarc",
    "title": "DMARC p=none (monitor only)",
    "points": 15,
    "severity": "warn"
   }
  ],
  "top_fixes": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mail-security-tools-email-security-score-c8e7d1db/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.mailsecuritytools.com](https://www.zero.xyz/host/api.mailsecuritytools.com/llms.txt)