Free email validation API. Detect disposable emails, check MX records, normalize addresses, and more.
Get Free API Key✓ No credit card required ✓ Unlimited requests
Verify the domain has valid mail servers configured.
Detect temporary email domains like Mailinator.
Normalize Gmail dots and plus aliases to catch duplicates.
Detect SimpleLogin, Firefox Relay, and email aliases.
Identify Gmail, Yahoo, Outlook vs business domains.
Suggest corrections for common typos like gmial.com.
# Make a request
curl "https://api.checksignup.com/validate?email=test@gmail.com&key=YOUR_API_KEY"{
"email": "john.doe+test@gmail.com",
"normalized": "johndoe@gmail.com",
"domain": "gmail.com",
"mx": ["gmail-smtp-in.l.google.com"],
"valid": {"syntax": true, "mx": true},
"flags": {
"disposable": false,
"forwarding": false,
"free": true,
"catchall": false,
"role": false
},
"typo_suggestion": null
}