Verify 500 to 1,000,000+ email addresses in minutes via real-time MX, Catch-All, and Smart SMTP handshakes. Upload your CSV, TXT, or Multi-Sheet Excel (.XLSX) workbook below to run a free instant pre-scan and live 5-email SMTP sample.
Supports .CSV, .TXT, .XLS and Multi-Sheet .XLSX. Duplicates and Unknowns are 100% free ($0).
See how much you save on bulk email verifier from 5,000 to 100,000 contacts with KaijuVerifier:
| Bulk Email Verifier Provider | 5k Tier (Bulk Email Verifier) | 10k Tier | 50k Tier | Unknowns Policy | Excel .XLSX Support |
|---|---|---|---|---|---|
| ⚡ KaijuVerifier (Bulk Email Verifier) | $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 just exported 5,000 B2B leads from Apollo.io or LinkedIn Sales Navigator, or you are cleaning a 100,000-subscriber newsletter in HubSpot, Mailchimp, or Klaviyo, our Bulk Email Verifier isolates every hard bounce and catch-all risk before you hit send.
Accurate verification across Gmail, Google Workspace, Microsoft 365, Yahoo, iCloud, and Proofpoint/Mimecast gateways with 24h catch-all caching.
Automatically flags 36 common mobile and checkout domain typos (like @gmial.com, @hotmial.com, @outlok.com) and outputs the corrected address for free.
Grab 5,000 never-expiring bulk verification credits for $19 one-time, or get 10,000 monthly credits for $19/mo with automatic unused credit rollover.
KaijuVerifier is the only bulk email verifier that natively supports Multi-Sheet Excel (.XLSX) workbooks alongside CSV and TXT files, charges $0 for Unknown or duplicate rows, and offers 5,000 non-expiring credits for $19 (or 10,000/mo for $19).
Yes. Every corporate domain is tested with a randomized control probe to detect catch-all (accept-all) mail servers so you can segment high-risk catch-all leads from guaranteed valid inboxes.
Yes. Our REST API includes POST /api/v1/verify-batch (up to 100 emails per request) and async POST /api/v1/jobs (up to 100,000+ emails with HMAC-SHA256 webhook completion callbacks).
Our Parallel Asynchronous Bulk Email Verifier is built around 7 Global MTA Probe Clusters + Anti-Greylisting, focused on Verifying 10,000 to 1,000,000+ row lists from $0.0003/email. Every check runs across our 7 distributed verification clusters with full TLS 1.3 security and zero data retention.
Unlike generic bulk tools that charge for duplicate rows or inconclusive timeouts, this workflow combines browser-native pre-scanning ($0 cost for duplicates and syntax errors) with live 7-Layer Smart SMTP verification starting at $19 for 5,000 non-expiring credits.
| Technical Dimension | Specification (7 Global MTA Probe Clusters + Anti-Greylisting) | Operational Outcome |
|---|---|---|
| Primary Architecture | 7 Global MTA Probe Clusters + Anti-Greylisting | Verifying 10,000 to 1,000,000+ row lists from $0.0003/email |
| Accuracy & Unknown Policy | 99.7% Definitive SMTP Precision | $0 charged for Unknown, Greylisted, or Duplicate rows |
| Supported Formats & API | CSV, TXT, .XLS, Multi-Sheet .XLSX & REST API | 100 free monthly checks + non-expiring Pay-As-You-Go packs |