Free tool
Free disposable email checker
Is it a throwaway address? And does the mailbox exist at all?
How this works
The domain is matched against a continuously updated list of throwaway providers, and the mailbox is verified against the mail server at the same time.
Those are two independent questions, and both answers are reported. A disposable address can be perfectly live right now; a permanent one at a real company can be dead. Conflating them is how a signup form ends up blocking a customer and admitting a bot.
When an address is both disposable and nonexistent, the result is undeliverable — a hard rejection from the mail server is stronger evidence than a classification, so it wins.
Questions, answered.
What is a disposable email address?
An address from a service that provides temporary, throwaway inboxes — used to get past a signup form without giving a real address. They are abandoned within hours, so anything you send afterwards is never read.
How do you detect disposable email addresses?
By matching the domain against a continuously updated list of throwaway providers. The check also verifies the mailbox itself, because the two questions are independent: a disposable address can be live, and a permanent one can be dead.
Should I block disposable addresses at signup?
Usually yes for a paid product, and more carefully for a free one — some people use them for legitimate privacy reasons. A middle path is to allow the signup but require confirmation before anything is granted.
What if an address is both disposable and nonexistent?
It is reported as undeliverable. A hard rejection from the mail server outranks the disposable classification — the strongest available evidence wins rather than the most recently checked signal.
What is the difference between disposable and free email?
A free provider is Gmail or Outlook — permanent, and normal for an individual. A disposable provider hands out temporary inboxes that expire. Both are flagged separately here, because for B2B one is a weak signal and the other is a red flag.