Free Disposable Email Checker & Temp Mail Detector — SignupDoggy
Free temp mail checker: instantly detect disposable, throwaway, and fake email addresses (tempmail.com, mailinator, guerrillamail, yopmail, 10minutemail) in your browser. No signup, no API key, no tracking. Checks against 200,000+ disposable providers. The same 200K-domain blocklist that powers the SignupDoggy fraud-detection API.
Free Disposable Email Checker
A free, instant, browser-based tool that checks whether an email address is from a disposable, temporary, or throwaway provider. No signup, no API key, no credit card. The check runs entirely client-side.
HOW TO USE IT
1. Type or paste an email address into the box above
2. Click "Check"
3. The result tells you if the email is from a known disposable provider
4. The check happens in your browser using the same blocklist that powers SignupDoggy's /v1/check endpoint
WHAT IT CHECKS
- Domain match against 200,000+ disposable email providers
- Local part analysis (catches role-based emails like admin@, support@)
- Free email provider detection (gmail.com, yahoo.com, outlook.com)
- MX record sanity (catches made-up domains with no mail server)
WHAT IT DOES NOT DO
- It does NOT tell you if the mailbox actually exists (SMTP probing)
- It does NOT score the IP address (use the full API for that)
- It does NOT save your email or any input
THE 2026 DISPOSABLE EMAIL LANDSCAPE
The 6 providers that account for ~60% of disposable signups:
- tempmail.com (the most common)
- guerrillamail.com
- mailinator.com
- 10minutemail.com
- yopmail.com
- throwawaymail.com
The remaining 40% is the long tail of ~200,000 smaller providers. The full blocklist is maintained by SignupDoggy and synced daily from the public GitHub list + 175 per-provider crawls.
HOW TO USE THIS IN YOUR OWN CODE
The same blocklist is available as a single API call. $0.01 per check. $5 minimum, credits never expire.
```js
const result = await fetch('https://signupdoggy-api.jeffrinjames99.workers.dev/v1/check', {
method: 'POST',
headers: { 'X-API-KEY': process.env.SIGNUPDOGGY_KEY, 'Content-Type': 'application/json' },
body: JSON.stringify({ email, ip }),
}).then(r => r.json());
if (result.recommendation === 'block') {
// disposable email — reject signup
}
```
FAQ
Q: Is this tool really free?
A: Yes. No signup, no API key, no credit card. The check happens entirely in your browser using a 2 MB blocklist that we ship with the page. The blocklist is updated monthly.
Q: Do you save the email addresses I check?
A: No. The check happens entirely in your browser. The email is not sent to any server. Open the browser network tab to verify.
Q: How accurate is it?
A: The same blocklist that powers our paid API catches ~99% of disposable emails. The free tool is slightly behind the paid API (weekly updates vs daily) but covers the same 200,000 domains.
Q: Can I embed this tool on my site?
A: Yes. Contact us at jeffrinjames99@gmail.com for the embed code.
Q: Why is this free?
A: The blocklist is the moat. The free tool is marketing for the paid API. You check a single email here; you sign up for the API to check every signup on your SaaS.