Temp mail checker
Is this email address disposable? Paste an address or a domain. We check 78,799 temp mail domains from 5 public lists (updated daily) and look at the domain's mail server. Every answer says why.
Try: mailinator.com duck.com john.doe+news@gmail.com
Email providerjohn.doe+news@gmail.com
A normal email provider.
- A well-known email provider. Not temp mail.
- Domain checked
- gmail.com
- Lists that name it
- 0 of 5
- Mail server
- gmail-smtp-in.l.google.com
- Real inbox (dots and + removed)
- johndoe@gmail.com
Same answer as JSON: email.tooljar.dev/api/check?q=john.doe%2Bnews%40gmail.com
What the checker looks at
78,799 domains
Merged from 5 open lists every day. A subdomain counts when its parent domain is listed.
443 temp mail servers
Servers that only temp mail domains use. New domains on them show as “suspicious”.
j.o.h.n+x@gmail.com
Gmail ignores dots and the + part. We show the real inbox, so 100 “different” addresses become one.
For developers
One word back, for scripts: disposable, suspicious, undeliverable or ok.
curl email.tooljar.dev/mailinator.comOr JSON with all the reasons: the free API. No key, CORS on, free for commercial use.
Questions
What is a temp mail address?
A throwaway email address from a site like Mailinator or temp-mail.org. It needs no sign-up, lives for minutes or hours, and anyone with the link (or sometimes anyone at all) can read its inbox. People use it to avoid spam. It is also the easiest way to make many fake accounts.
What does “suspicious” mean?
The domain is on no list, but its mail server also handles several known temp mail domains and no popular website uses that server. Temp mail services change their domain names often but keep their servers, so this catches new domains early. It can be wrong (for example on shared web hosting), so treat it as a warning, not proof.
Why are DuckDuckGo, Firefox Relay and SimpleLogin addresses “ok” here?
They are privacy forwarding services: the address forwards to the person's real inbox and lasts as long as they want. Some lists call them temp mail. We don't, because blocking them mostly hurts careful, honest people.
Should I block temp mail when people sign up?
Usually flag it rather than block it: ask for another address, or add a check before free trials. Our guide explains the trade-offs.
Do you store the addresses I check?
No. We don't log or store them. To check the mail server we send only the domain (the part after the @) to Cloudflare's public DNS resolver 1.1.1.1.
Can I use the API in my product?
Yes, it is free, needs no key, and commercial use is allowed. Please stay within the fair-use limit on the API page.
A domain is wrong. How do I report it?
Open an issue on GitHub with the domain and why it is wrong. For list entries we also tell the list's maintainers, because the data comes from public lists.