Disposable email checker
Find out whether an address comes from a temporary inbox like Mailinator, 10 Minute Mail, or Guerrilla Mail, the kind people use to get past a sign-up form.
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Keep throwaway sign-ups out of your pipeline.
GoodInbound is a form backend and lead screen for any form. It:
- Screens every submission for bots, fake sign-ups, and unsolicited sales pitches, whether a person or an AI wrote them.
- Labels each one lead, review, spam, junk, or bot, with a one-line reason.
- Enriches real leads and notifies you by email, Slack, or Telegram.
- Sends only real leads on to your CRM, workflows, and ad platforms.
What a disposable email address is
A disposable email address is a temporary inbox that works for a few minutes or hours and then disappears. Services like Mailinator, 10 Minute Mail, YOPmail, and Guerrilla Mail hand them out without a sign-up. They're handy for privacy, and they're also how people grab a free trial, a download, or a discount without ever becoming a real contact.
How the check works
The domain of the address is matched against a list of more than 9,000 known disposable providers, maintained by the open-source disposable-email-domains project, plus GoodInbound's own additions. If the domain isn't disposable, the checker also reports whether it's a free provider, whether it can receive mail, and how old it is.
New throwaway domains appear every week, so no list catches all of them. Very new domains with no history are a strong hint even when they aren't on the list yet.
Should you block disposable emails?
On demo requests, quote forms, and trials, usually yes: someone who won't give a real address isn't a lead you can follow up with. On newsletters and gated content it's a judgment call. Many teams accept the sign-up but keep it out of sales follow-up and ad conversions.
Questions
Check its domain against a list of disposable providers, as this tool does. Very new domains and domains with no mail history are also strong hints.
No. They're legal privacy tools. Businesses are also free to decline them on their own forms and sign-ups.
No list is complete, because new throwaway domains appear constantly. Pair the list with other signals, such as domain age and how the form was filled in, to catch the rest.
From the open-source disposable-email-domains project (public domain), plus additions from GoodInbound's own screening.