How the checker works
When you press Check, your browser downloads a public list of about 10,000 known disposable email domains (the community-maintained disposable-email-domains list, released into the public domain under CC0), plus our own domains. Each address is compared with the list locally. Nothing you paste is sent anywhere.
A domain is flagged if it's on the list, or if it's a subdomain of a listed domain (for example x.mailinator.com).
Reading the results
| Disposable | The domain is a known temporary-mail provider. |
| Not listed | Not on the list. That doesn't prove it's a long-term address: new disposable domains appear every day, and private domains can be anything. |
| Invalid | Doesn't look like an email address or domain. |
For site owners: should you block disposable email?
It depends on what you're protecting. Blocking makes sense where one person creating many accounts costs you money, such as free credits, trials or referral bonuses. For newsletters, downloads and community sign-ups, blocking mostly turns away privacy-minded people, and they often come back later with a real address once they trust you. A middle ground many sites use is to accept disposable addresses but require a long-term address before the account can do anything valuable.
If you do block, keep your list up to date (the list above changes weekly) and tell people clearly why their address was refused.
Questions
Is Volt Ghost on the list?
Yes, our domains mailghost.cyou and mailghost.cfd are flagged as disposable. We don't try to hide what we are.
Can I use this list in my own app?
The upstream list is CC0, so yes. Get it from the project's repository so you receive updates.