Disposable Email Domain Checker

What is a disposable email address?

A disposable (or temporary) email address is a throwaway inbox that works for a short time and then disappears. People use them to sign up for sites, grab free trials, or receive one-time verification codes without exposing their real address. Services like MailboxTemp, Mailinator, and 10 Minute Mail all provide them. For users that's great for privacy — but if you run a website, a flood of disposable signups can distort your metrics and invite abuse.

Why check for disposable domains?

• Cleaner signups. Decide whether to allow, flag, or require a second step for throwaway addresses at registration.
• Better data. Disposable signups inflate user counts and skew conversion and retention numbers.
• Less abuse. Free-trial farming and spam accounts often ride in on disposable domains.
• Deliverability. Marketing to dead temporary inboxes hurts your sender reputation and bounce rate.

Is this checker private?

Yes. The list of known disposable domains is downloaded to your browser once, and every match happens locally on your device. The emails or domains you paste are never sent to, logged by, or stored on our servers — close the tab and they're gone. That's the same privacy-first principle behind our disposable email service and our password generator.

Checking signups automatically? Use the API

This tool is for quick manual checks. If you need to validate addresses programmatically — for testing flows, QA, or accepting throwaway inboxes on purpose — MailboxTemp offers a free disposable email API and an open-source npm client so you can generate inboxes and read verification codes from your own code.

A note on accuracy

No blocklist is ever complete — new disposable domains appear constantly, and some providers rotate domains specifically to avoid lists. A "not found" result means the domain isn't in this known list, not a guarantee that it's a permanent mailbox. Use it as a strong signal, not an absolute verdict.