Paste up to 500 emails. We run 4 validation layers (syntax, disposable, role-based, MX record) and return clean lists in 5-15 seconds. Catches ~70-80% of bad emails. No signup required to try.
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This verifier runs 4 layers of validation, all using publicly available techniques. No external paid APIs, no enrichment credits, no data shared with third parties. The verification happens via a Vercel serverless function with DNS lookups; your email list is processed in memory and not stored.
RFC 5322 regex validation. Catches typos like missing @, invalid TLDs, illegal characters. Catches ~5% of bad inputs.
Cross-checks against a bundled list of 300+ disposable email providers (mailinator, tempmail, etc). Catches throwaway addresses.
Flags info@, sales@, contact@, no-reply@ and other role addresses. We flag rather than reject because some are legitimate but they typically have lower reply rates.
Live DNS lookup confirms the domain has a valid mail server configured. Catches the biggest category of dead emails: misspelled or expired domains.
This verifier does not SMTP-probe inboxes. SMTP probing is what paid verifiers like ZeroBounce or Hunter use to confirm an email actually exists. It works, but it can damage your sending IP reputation if done at scale, and it costs the service money to do. We skip it to keep this 100% free and safe.
Expected accuracy: 70-80% of bad emails caught. The remaining 20-30% (catch-all domains, full mailboxes, suspended users) will still pass our checks but fail when you actually send. For mission-critical lists, layer a paid SMTP verifier on top of this output.
We run a Clay-based 4-provider waterfall + verification on every list before any cold email goes out.
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