Free tool
Disposable email checker
Find out whether an email address is temporary. Enter an address or a domain and it is checked against 9,927 known disposable email domains, its mail server is looked up, and Gmail’s dot and plus tricks are unpicked. It runs in your browser and keeps nothing.
What the checker looks at
- The disposable list. The domain, and any parent of it, is compared with an open list of temporary email domains maintained on GitHub. A match means the address belongs to a throwaway service.
- The mail server. The domain’s MX records are looked up. A domain with no mail server cannot receive anything, which usually means the address is mistyped or invented.
- The provider. Big free webmail services are named. They are real mailboxes, but opening one takes a minute.
- Gmail’s aliases. For a Gmail address, the dots and any +tag are removed to show the inbox the mail really reaches, since plus addressing and the dot trick make one inbox look like many.
What a result does not prove
A clean result means the domain is not a known throwaway one, not that the address is permanent or belongs to who it claims. Temporary services that use real gmail.com addresses pass every domain check, and new disposable domains appear faster than any list can follow. The only proof that someone can read an address is a code sent to it and typed back.
For website owners
If you are deciding whether to block disposable sign-ups, read why websites block temp mail first: lists stop the casual cases, but protecting a free trial works better with limits per card or device. And if you test your own sign-up flow, the email sign-up testing checklist covers what to try.
Questions
How do I know if an email address is disposable?
Check its domain, the part after the @. If the domain belongs to a temporary email service, the address is disposable. This checker compares it with a public list of 9,927 such domains and also checks that the domain has a mail server at all.
Can a disposable address end in gmail.com?
Yes. Some temporary email services, this one included, hand out real gmail.com addresses on shared accounts. No domain check can tell those apart from anyone else’s Gmail, which is why a gmail.com address is reported as free webmail rather than as safe.
Is the address I enter stored or shared?
No. The check runs in your browser. Only the domain is sent to a public DNS resolver (Cloudflare, or Google if that fails) to look up its mail servers; the full address never leaves your device, and we keep nothing.
Should my website block disposable email addresses?
Block lists catch the obvious ones but miss shared Gmail addresses and new domains, and they annoy real people who use privacy services. If you are protecting free trials or bonuses, limiting them per payment method or device works better than blocking by address.
Disposable domain list: disposable-email-domains (CC0 public domain), 9,927 domains, updated October 25, 2026. Need a disposable address of your own? Get a temporary Gmail address.