Verify bulk lists (.CSV, .TXT, Multi-Sheet .XLSX) and real-time signups with 98.5%+ accuracy. Powered by our 7-Layer Smart SMTP & Catch-All Engine with strict Zero-Retention RAM privacy and $0 billing for Unknowns.
Drop any .CSV, .TXT, .XLS or Multi-Sheet .XLSX file — Unknowns and Duplicates are 100% free ($0).
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 |
Whether you send 10,000 cold outreach emails a month or manage a 1,000,000-contact CRM in HubSpot, Salesforce, or Klaviyo, our email verification service protects your domain reputation without enterprise lock-in:
Real-time syntax, DNS/MX, 1M+ disposable domains, typo auto-correction, role detection, catch-all probing, and non-intrusive RCPT TO mailbox verification.
Upload multi-tab Excel workbooks directly and download them back with every sheet, formula, and CRM column preserved intact.
Credits are only deducted for definitive Valid or Invalid verdicts. Pay-As-You-Go packs ($19 / 5k) never expire, and monthly plan credits roll over automatically.
Our 7-Layer Smart SMTP & Catch-All Engine achieves 98.5%+ accuracy across B2B (Google Workspace, Microsoft 365, Proofpoint, Mimecast) and consumer providers (Gmail, Yahoo, Outlook, iCloud), backed by our 99% Deliverability Guarantee.
Yes. Every account includes full access to both our Bulk CSV/XLSX Cleaner and our sub-250ms REST API (POST /api/v1/verify and /api/v1/verify-batch) using the same credit balance.