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
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.
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