Don’t risk domain blacklisting or ESP account suspension. Drop your CSV, TXT, or Excel file below to check your email list for dead mailboxes, syntax errors, disposable burners, and catch-all servers in seconds.
See your exact duplicate count, typo domains, and 5 live SMTP verdicts in under 2 seconds — no signup required for preview.
See how much you save cleaning 5,000 to 100,000 emails with KaijuVerifier:
| Provider | 5,000 Emails | 10,000 Emails | 50,000 Emails | Unknowns Charged? | Multi-Sheet .XLSX |
|---|---|---|---|---|---|
| ⚡ KaijuVerifier | $19 (Never Expires) | $19/mo (Rollover) | $49/mo (Save 88%) | ✅ $0 (100% Free) | ✅ Native Multi-Tab |
| ZeroBounce | $45 | $99 | $390 | ❌ Charged | ❌ CSV only |
| NeverBounce | $40 | $50 | $250 | ❌ Charged | ❌ CSV only |
| Bouncer (UseBouncer) | $40 | $60 | $250 | ✅ Refunded | ❌ CSV only |
| Emailable | $38 | $60 | $225 | ✅ Refunded | ❌ CSV only |
| EmailListVerify | $15 | $27 | $169 | ⚠️ Manual ticket | ⚠️ Single-sheet |
Checking an email list requires more than regex syntax validation. Over 80% of hard bounces come from syntactically valid addresses on real domains where the individual employee mailbox was deactivated.
Your browser immediately counts total rows, strips duplicate addresses for $0, and flags role accounts (info@, admin@) and typo domains.
We run a real-time MX and SMTP RCPT TO handshake on the first 5 emails of your file right on screen so you can verify our accuracy before unlocking.
Clean up to 100 emails/month free, or unlock up to 5,000 emails for a $19 one-time payment (or 10,000 emails for $19/mo) via 1-click Google + Stripe checkout.
Upload your .CSV, .TXT, or .XLSX file into the drop-zone above. KaijuVerifier automatically detects the email column, removes duplicates for free, tests a 5-email sample live via SMTP, and lets you export only 100% deliverable addresses.
Never. KaijuVerifier performs a non-intrusive SMTP RCPT TO handshake and disconnects before the DATA command, so your recipients never receive any message or notification.