Weeks of inbox warmup in Instantly.ai can be destroyed in a single afternoon if a scraped lead list exceeds a 2% hard bounce rate. Pre-clean your CSV/XLSX lists with 7-Layer Smart SMTP & Catch-All detection.
Instantly.ai
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Target Field: email (Instantly Lead List)
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Compliance Guard: Instantly Bounce Shield (<1% Hard Bounce Target)
Count unique contacts, remove duplicates free ($0), preview 5 live SMTP checks, and unlock full list cleaning for $19.
Across Instantly.ai workspaces, roughly 16% of unverified email (Instantly Lead List) records are invalid, deactivated, disposable, or duplicate contacts that inflate your Instantly.ai invoice every month:
Before importing leads from Apollo, Clay, Sales Navigator, or D7 into an Instantly campaign, drop the file into KaijuVerifier.
Our engine runs live MX, SMTP RCPT TO, disposable, role-inbox, and catch-all probes while preserving all custom personalization variables ({{firstName}}, {{icebreaker}}).
Upload the Valid CSV directly into your Instantly campaign to keep hard bounces below 0.4% and maximize primary inbox placement.
Use Clay, Make, or n8n to call POST https://kaijuverifier.com/api/v1/verify before pushing leads to the Instantly.ai 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 (Instantly Lead List)}}"}'KaijuVerifier costs just $19 for 10,000 verifications ($49 for 50,000), charges $0 for Unknown/Greylisted servers, preserves Multi-Sheet Excel (.xlsx) files, and gives you granular Catch-All and Role-Account segments so you never burn warmed sender domains.
To keep Google Workspace and Microsoft 365 sender mailboxes out of spam, your hard bounce rate must stay below 1.0% (and ideally under 0.5%).
Synchronizing Instantly.ai Cold Outreach with KaijuVerifier protects your workspace via Secondary Domain & Warmup Reputation Shield while automating Keep Campaign Bounces < 0.5% Across Unlimited Sending Inboxes. Unverified CRM imports silently accumulate 15% to 22% invalid, catch-all, role-based, and disposable addresses that degrade deliverability and inflate monthly seat costs.
By piping your Instantly.ai Cold Outreach exports through our native Multi-Sheet Excel (.XLSX) and CSV scrubber — or connecting real-time webhooks to POST /api/v2/leads (Verified Valid Only) — you isolate 550 hard bounces before a single campaign leaves Instantly.ai Cold Outreach, paying $0 for duplicates and inconclusive greylisted unknowns.
| Instantly.ai Cold Outreach Integration Layer | Technical Sync Mechanism | Deliverability & Billing Outcome |
|---|---|---|
| Compliance & Bounce Shield | Secondary Domain & Warmup Reputation Shield | Keeps hard bounce rate below 0.28% across all Instantly.ai Cold Outreach sends |
| CRM Cost Optimization | Keep Campaign Bounces < 0.5% Across Unlimited Sending Inboxes | Eliminates paying monthly storage fees for dead & throwaway contacts |
| REST API / Webhook Endpoint | POST /api/v2/leads (Verified Valid Only) ↔ /api/v1/verify-single | Sub-350ms real-time tagging or 100,000+ rows/hr batch sync |