lemlist Email Verification & Bounce Shield
A single batch of bounced emails in lemlist can ruin weeks of lemwarm domain warming. Scrub your CSV and Multi-Sheet Excel lead lists with 7-layer SMTP + Catch-All AI before importing.
lemlist
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Target Field: email (lemlist Lead Import CSV)
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Compliance Guard: lemwarm Deliverability Threshold (<1.5% Bounce Rate)
⚙️ Lemlist Telemetry Specs
Drop Your lemlist CSV or Excel Export — Free Pre-Scan + 5-Email Live SMTP Sample
Count unique contacts, remove duplicates free ($0), preview 5 live SMTP checks, and unlock full list cleaning for $19.
⚙️ Integrations · Lemlist Pipeline Specifications & Column Rules
Calculate Your lemlist Savings
Across lemlist workspaces, roughly 16% of unverified email (lemlist Lead Import CSV) records are invalid, deactivated, disposable, or duplicate contacts that inflate your lemlist invoice every month:
How to Verify Your lemlist List in 3 Steps
1. Export Your Prospect List (Apollo, Sales Nav, Clay)
Download your B2B prospect list as CSV or Multi-Sheet Excel (.XLSX) before uploading to lemlist.
2. Run 7-Layer SMTP + Canary Catch-All Verification
Upload your file to KaijuVerifier. We test every mailbox against Google Workspace, Microsoft 365, and custom B2B gateways while scoring Catch-All risk (0–100).
3. Download Verified Valid Leads for lemlist
Export the "Valid Only" segment so your lemlist sequences achieve <0.5% bounce rate from day one.
Call POST https://kaijuverifier.com/api/v1/verify-single in Make, n8n, or Clay right before pushing leads to the lemlist Add Lead API.
curl -X POST https://kaijuverifier.com/api/v1/verify \
-H "Authorization: Bearer kv_live_your_api_key" \
-H "Content-Type: application/json" \
-d '{"email": "{{email (lemlist Lead Import CSV)}}"}'
Frequently Asked Questions — lemlist Email Verification
Why use KaijuVerifier instead of lemlist’s internal email finder/verifier credits?
Verifying large B2B lists with KaijuVerifier costs as little as $0.00095/email ($9.50 for 10,000 emails in your first month or $9.50 for a 5,000 one-time pack)—saving up to 80% while giving you full Multi-Sheet Excel support.
Should I send lemlist cold emails to Catch-All domains?
Only if the KaijuVerifier deliverability score is >= 75 and you send from secondary warmed domains. For primary domains, stick to 100% Valid mailboxes.