MailCheck.ai API
Overview
MailCheck.ai (powered by UserCheck) is a free API that detects whether an email domain belongs to a known temporary or disposable email provider, helping prevent fake sign-ups without requiring authentication. It checks a continuously updated blocklist of throwaway email domains and returns a simple boolean result. No API key is needed for the basic disposable-check endpoint.
Beginner Tip
MailCheck.ai is one of the simplest no-auth APIs available — just append a domain to the URL and you get back a JSON object with a disposable field. Use it to block throwaway email addresses from your sign-up form with a single fetch call.
Available Data
Example Response
{
"message_id": "msg_abc123def456",
"status": "delivered",
"to": "[email protected]",
"subject": "Welcome!",
"timestamp": "2025-01-15T10:30:00Z"
} Field Reference
domain The domain name that was checked against the disposable email blocklist mx True if the domain has valid MX records configured, indicating it can receive email disposable True if the domain is on the known disposable or temporary email provider blocklist alias True if the domain appears to be an email alias or forwarding service rather than a primary mailbox provider Implementation Example
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); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Matrix Score Breakdown
Fully tested on Apr 5, 2026
Technical Specifications
Related Tags
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