MailCheck.ai API

Overview

Measurement Record

What actually happened when we called this API from our own infrastructure. Every value below was recorded by the request, not copied from the provider's documentation.

Request

GET https://api.mailcheck.ai/domain/mailinator.com

Result

HTTP 200 · application/json · 354 bytes · compressed

Response time

157 ms (median of 3) · fastest 151 ms

Transport

TLSv1.3 · TLS_AES_256_GCM_SHA384 · certificate issued by Google Trust Services

Browser CORS

Allowed — Access-Control-Allow-Origin: *

Rate limit

5 per window (0 remaining at test time)

Served by

cloudflare

Recorded

2026-08-10

Fields Returned

Top-level fields present in the response we captured, with the type and value we actually received.

Captured Response

Captured from a real request to https://api.mailcheck.ai/domain/mailinator.com on 2026-08-10. Long arrays and nested objects are truncated to keep the shape readable.

{
  "status": 200,
  "domain": "mailinator.com",
  "domain_age_in_days": 8440,
  "mx": true,
  "mx_records": [
    {
      "hostname": "mail.mailinator.com",
      "priority": 1
    }
  ],
  "mx_providers": [],
  "spf": "strict",
  "dmarc": "reject",
  "disposable": true,
  "public_domain": false,
  "relay_domain": false,
  "free_subdomain": false,
  "spam": true,
  "did_you_mean": null
}

Implementation Example

Calls a real endpoint of this API. Replace any placeholder credentials with your own key.

const url = "https://www.mailcheck.ai/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

import requests

url = "https://www.mailcheck.ai/"
headers = {}

response = requests.get(url, headers=headers, timeout=30)
response.raise_for_status()
data = response.json()
print(data)

curl "https://api.mailcheck.ai/domain/mailinator.com"

What Can You Build?

// Verify if an email is valid and deliverable
const email = '[email protected]';
const response = await fetch(`https://www.mailcheck.ai/#documentation`);
const data = await response.json();
console.log('Email valid:', data.valid || data.is_valid);
console.log('Deliverable:', data.deliverable ?? 'Unknown');

// Send an email via MailCheck.ai
const response = await fetch('https://www.mailcheck.ai/#documentation', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-Api-Key': 'YOUR_API_KEY'
  },
  body: JSON.stringify({
    to: '[email protected]',
    subject: 'Hello from MailCheck.ai',
    body: 'This is a test email.'
  })
});
const result = await response.json();
console.log('Email sent:', result);

// Detect disposable/temporary email addresses
const email = '[email protected]';
const response = await fetch(`https://www.mailcheck.ai/#documentation`);
const data = await response.json();
const isDisposable = data.disposable || data.is_disposable || false;
console.log(`${email} is ${isDisposable ? 'disposable ⚠️' : 'legitimate ✅'}`);

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

How This API Fails

We deliberately sent this API a broken request and recorded exactly what came back on 2026-08-10. Knowing the shape of an error before you hit it makes error handling much easier to write.

{
  "status": 429,
  "error": "Too many requests"
}

Common Errors & Troubleshooting

Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.