Disposable Email Detector

Detect temporary, throwaway and burner email addresses before they enter your CRM. Backed by 15,000+ known disposable domains plus MX fingerprinting for new providers. Real-time API, 99% catch rate.

Why block disposable emails?

• They never engage. Zero opens/clicks signal ISPs that your content is irrelevant.
• They churn fast. The mailbox is gone by the time you send a follow-up → hard bounce.
• They skew analytics. Signups look good, activation collapses.
• They waste ESP credits. You pay per send to reach a mailbox that no longer exists.

How detection works

1. Domain blacklist — 15,000+ known disposable domains (Mailinator, 10minutemail, TempMail, YOPmail, Dispostable, Guerrilla Mail, and thousands more).
2. MX fingerprinting — even brand-new domains often share MX servers with known disposables.
3. Pattern heuristics — random-looking local parts, newly-registered domains, free TLDs like .tk/.ml.
4. SMTP behaviour — catch-all servers that accept every address then bounce them all.

Categories of disposable addresses

Type	Examples	Default action
Public listen-only	Mailinator, Dispostable	Block
Time-limited	10minutemail, TempMail	Block
Privacy alias forwarder	SimpleLogin, Firefox Relay, AnonAddy	Allow (configurable)

Integrate at signup (code sample)

POST https://kaijuverifier.com/api/v1/verify-single
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

{"email": "user@10minutemail.com"}

→ 200 OK
{
  "email": "user@10minutemail.com",
  "status": "risky",
  "is_disposable": true,
  "is_role": false,
  "is_catchall": false,
  "reason": "disposable"
}

See the full API documentation for PHP, Python, Node and cURL examples.

FAQ

What's the difference between disposable and throwaway email?

Nothing — they're synonyms. "Temp-mail", "burner" and "10-minute email" all describe the same class.

Is Gmail a disposable email?

No. Gmail mailboxes are permanent personal inboxes. Only addresses on domains like 10minutemail, Mailinator, TempMail etc. count as disposable.

Can I see a list of disposable domains?

Open-source lists exist on GitHub, but they lag current activity by days-to-weeks. KaijuVerifier updates its list daily and augments with MX fingerprinting. For the detection methodology in depth, see our disposable email detection deep dive.

Does blocking disposables hurt signup conversion?

Typically less than 2% — the users who bring real revenue rarely sign up with a temp-mail. Test with soft flagging first if you're unsure.