Email checker
Paste any email address and see what a fraud engine sees: disposable domains, dead mailboxes, sender-auth, domain age, the identity key that reveals when two addresses reach the same inbox, and a fraud score. Free, no signup, nothing stored.
What it checks
Disposable domain
160,000 throwaway/temporary providers, refreshed daily from multiple sources
MX records
the actual mail servers, a domain with none can't receive mail
SPF / DMARC
whether the domain publishes sender-auth records
Domain age
registration date via RDAP, brand-new domains are higher risk
Role account
info@, support@, admin@ … addresses that aren't a person
Gibberish
machine-generated mailboxes, scored on the address's canonical form
Same-inbox aliases
+tags, gmail dot tricks and provider aliases all collapse to one identity key, so you can tell when two different-looking addresses reach the same mailbox
This is one endpoint of the Kaidn API. The full /v1/score adds device reuse, velocity, geo mismatch, IP intelligence, custom rules, and plain-English explanations for every verdict.