# Email Address Validation and Domain Mail Check

> Email Address Validation and Domain Mail Check is a paid API for AI agents from domain-dns.x402tookit.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-25).

Validates an email address for syntax correctness, domain MX record existence, role account status, and disposable domain detection.

## Facts

- Endpoint: GET https://domain-dns.x402tookit.com/email-check?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-address-validation-and-domain-mail-check-0e11b8c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Pk3cLB9ieiMxa-6rMWSuN

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-domain-mail-check-0e11b8c3
```

Example prompt: Can you check whether john.doe@tempmail.org is a valid, deliverable email — I want to know if it has proper MX records, whether it's a disposable or role-based address, and if the syntax is correct?

## When to prefer this

Choose this endpoint when you need a combined, single-call check of email syntax, domain MX availability, role account detection, and disposable domain flagging — rather than calling separate DNS lookup and syntax validation tools individually. Ideal for pre-signup screening, lead validation, or bounce prevention workflows where you need a clear pass/fail verdict with reasons.

## Known failure modes

- Missing 'email' query parameter returns an error
- Malformed email string may return syntaxValid=false with no further checks
- DNS lookup failures may degrade MX resolution results with degraded=true
- Unknown or very new domains may have incomplete RDAP/DNS data
- Disposable domain lists may not be exhaustive for newly created throwaway services

## How this service works

Email address screen: syntax, whether its domain accepts mail (MX), role account and known disposable domain flags.

## Output

Returns a structured verdict including: whether the email syntax is valid, whether the domain exists and has MX records, whether it is a null-MX or implicit-MX domain, whether the address is a role account (e.g. admin@, info@), whether the domain is a known disposable provider, a human-readable summary and list of reasons, and a timestamp indicating data freshness.

## 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 to check"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "hasMx": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "local": {
       "type": [
        "null",
        "string"
       ]
      },
      "domain": {
       "type": [
        "null",
        "string"
       ]
      },
      "nullMx": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "sourceUrl": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "implicitMx": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "roleAccount": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "syntaxValid": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "domainExists": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disposableDomain": {
       "type": [
        "boolean",
      
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-address-validation-and-domain-mail-check-0e11b8c3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-dns.x402tookit.com](https://www.zero.xyz/host/domain-dns.x402tookit.com/llms.txt)