# Email Address Validation and Deliverability Checker

> Email Address Validation and Deliverability Checker is a paid API for AI agents from ai-policy-kit.moneymaker-ai.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).

Validates an email address for syntax, domain existence, MX records, SPF/DMARC configuration, and overall deliverability verdict.

## Facts

- Endpoint: GET https://ai-policy-kit.moneymaker-ai.workers.dev/api/email-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-address-validation-and-deliverability-checker-06b47e3f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_m4_kMsNK-UASkr1dS_e3v

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 email-address-validation-and-deliverability-checker-06b47e3f
```

Example prompt: Can you check whether support@github.com is a real, deliverable email address — specifically whether the domain has valid MX records, SPF, and DMARC set up?

## When to prefer this

Use this endpoint when you need a comprehensive, multi-signal email validation that goes beyond simple regex checks — covering DNS MX lookup, SPF/DMARC presence, role account detection, and an overall deliverability verdict in a single call. Prefer this over basic syntax validators when you need to know if an email domain actually accepts mail.

## Known failure modes

- Missing or malformed email query parameter returns an error
- Domain with no MX records returns null_mx: true and a non-deliverable verdict
- Invalid email syntax returns syntax_valid: false
- Non-existent domain returns domain_exists: false
- DNS lookup timeouts may cause delayed or failed responses
- Rate limiting may occur for high-frequency requests

## How this service works

Generate an AI_POLICY.md and a pull request template with an AI-disclosure section for your open-source repo. Free, runs in your browser.

## Output

Returns a JSON object containing: MX record list with priorities, SPF and DMARC boolean flags, deliverability verdict string (e.g. 'domain_accepts_mail'), domain existence flag, syntax validity, role account detection, plus-tag support flag, null MX flag, A-record fallback flag, parsed local part, and domain name.

## 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": [
      "email"
     ],
     "properties": {
      "email": {
       "type": "string",
       "description": "email address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "mx": [
   {
    "host": "github-com.mail.protection.outlook.com",
    "priority": 0
   }
  ],
  "spf": true,
  "dmarc": true,
  "email": "support@github.com",
  "domain": "github.com",
  "null_mx": false,
  "verdict": "domain_accepts_mail",
  "plus_tag": false,
  "a_fallback": false,
  "local_part": "support",
  "role_account": true,
  "syntax_valid": true,
  "domain_exists": true,
  "deliverable_domain": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-address-validation-and-deliverability-checker-06b47e3f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ai-policy-kit.moneymaker-ai.workers.dev](https://www.zero.xyz/host/ai-policy-kit.moneymaker-ai.workers.dev/llms.txt)