# Mail Security Tools Bulk Domain Email Security Scorer

> Mail Security Tools Bulk Domain Email Security Scorer is a paid API for AI agents from api.mailsecuritytools.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-10-19).

Scores up to 100 domains at once for email security posture, returning a letter grade, numeric score, and issue list for each domain.

## Facts

- Endpoint: GET https://api.mailsecuritytools.com/v1/bulk-score?utm_source=zero.xyz
- Price: $0.5/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-bulk-domain-email-security-scorer-d459dfca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JD73TuxTJkBcCtpnw7YFS

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-bulk-domain-email-security-scorer-d459dfca
```

Example prompt: Can you run a bulk email security score on these domains: example.com, acme.org, testco.net — I want to see the grade and any issues for each one?

## When to prefer this

Choose this endpoint when you need to assess email security posture (SPF, DKIM, DMARC, etc.) for multiple domains in a single call rather than one at a time. It is ideal for MSPs auditing client portfolios, security teams doing periodic sweeps, or marketers validating sender domains before campaigns. Prefer it over single-domain checkers when you have 2–100 domains to evaluate and want a consolidated grade summary.

## Known failure modes

- Domains list exceeds 100 entries — API may reject or truncate the request
- Malformed domain strings in the comma-separated list — individual domain entries may return an error status
- Network timeout for very large batches close to the 100-domain limit
- Invalid query parameter format — missing or empty 'domains' param returns an error
- DNS lookup failures for non-existent domains may return a failed status per domain

## 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 JSON object with a 'results' array where each entry contains the domain name, a letter grade (A–F), a numeric score (0–100), a list of specific issues found, and a status field. A 'summary' object provides grade distribution counts, total domains scored, and the average score across all 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": [
      "domains"
     ],
     "properties": {
      "domains": {
       "type": "string",
       "maxLength": 12000,
       "description": "Comma-separated domains, max 100"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "report": "bulk_email_security_score",
  "results": [
   {
    "grade": "B",
    "score": 80,
    "domain": "example.com",
    "issues": [],
    "status": "ok"
   }
  ],
  "summary": {
   "grades": {
    "A": 0,
    "B": 1,
    "C": 0,
    "D": 0,
    "F": 1
   },
   "scored": 2,
   "average_score": 61
  },
  "domain_count": 2
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mail-security-tools-bulk-domain-email-security-scorer-d459dfca/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)