Free tools, honest scope.
Each tool checks exactly one thing. None of them can prove a mailbox exists — only the API's SMTP probe can do that.
regex · local · no network
Email Syntax Checker
Is this address even shaped like an address? RFC-style parsing, normalization, length limits.
Open tool →live DNS · no mail sent
MX Record Lookup
Does the domain accept mail at all? Live DNS lookup of MX records for any domain.
Open tool →provider list · local
Disposable Email Detector
Is this a throwaway domain? Matched against a list of known temporary providers.
Open tool →heuristics · local
Role-Based Email Checker
Is this info@, sales@, or a real person? Heuristics on the local part of the address.
Open tool →Need a verdict, not a hint?
The API runs the full pipeline — syntax, DNS, SMTP handshake, catch-all probe — and returns a reason for every verdict. These tools never send email and never touch your list.