Free tool
Check whether an email address is disposable or risky, with Ksar’s real engine. Free, no signup, nothing is stored.
A disposable (or temporary) address is created in seconds on services such as Yopmail or Mailinator, then abandoned. It lets people sign up without giving a real address: handy to abuse a welcome code, a free trial or free credits, again and again.
Ksar combines several signals: lists of over 97,000 disposable domains kept up to date, mail servers used by these services, presence of a mail server and a website, the shape of the address, and privacy relays. The score ranges from 0 (no risk) to 100 (address to block).
Check the address at signup, server-side, and decide: accept, block, or accept the account without granting the promo offer. Ksar also detects the same person behind several addresses (Gmail dots, +aliases), which no list can see.
The same analysis, in under 50 ms, right in your form: block disposable addresses and keep your promo offers for real customers.