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)
Instant client-side pre-scan (0 credits) + live 5-email Smart SMTP sample check before you even sign up.
On average, 16% of unverified CRM/ESP lists consist of invalid, deactivated, disposable, or duplicate contacts that you pay to store every single month. Slide your list size below:
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%).