Free tools

Email and domain tools, free to use

Ten focused checks for verifying addresses and diagnosing a sending domain. Each one shows its work, the raw record or SMTP reply alongside a plain-English read, so you can see why, not just what. No account needed.

Verify addresses

Verify emailOne address, the full check Email syntaxCheck the format without sending Disposable checkCatch throwaway domains Catch-all checkDomains that accept anything

Diagnose a domain

MX lookupWho receives mail for a domain SPF checkerWhich servers may send DKIM checkerSignature record by selector DMARC checkerPolicy and alignment Deliverability scanEvery domain check in one pass Blacklist monitorListed on a blocklist or not

We don't save the address or domain you check.

Cleaning a whole list? Cull the bad addresses in bulk with a free account, 500 verifications a month.

Start for free