KillBounce - Bulk Email Validation at Scale

Verify 1,000 emails in 60 seconds for $4. Stop bounces before they happen.

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Updated Jul 2026 · Added Jul 2026

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What is Killbounce?

KillBounce is an email verification tool that prevents bounces by validating email addresses before sending campaigns. It uses a three-layer verification process (syntax check, DNS/MX validation, and live mailbox probe) to score each address 0–100 in seconds. The tool is designed for marketing teams, agencies, and businesses sending bulk emails who want to protect sender reputation and maximize inbox placement.

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Key Features of Killbounce

Three-layer email verification (syntax, DNS, live mailbox probe)
Score each address 0–100
Verify up to 5M addresses per job
Auto-deduplication across 10+ formats
CSV, TXT, XLS, and paste input options
Native integrations with Mailchimp, HubSpot, Salesforce, Brevo, SendGrid, Klaviyo, ActiveCampaign, Zapier, Make, n8n, Postmark, AWS SES
Export clean lists via CSV or API
Domain reputation monitoring
Refund guarantee if verified email bounces
Credits never expire

Who Should Use Killbounce?

Protect sender reputation before bulk email campaigns

Prevent sender score collapse from high bounce rates

Maximize inbox placement for marketing emails

Clean email lists before sending to CRMs

Reduce wasted spend on unreachable addresses

Maintain domain health for email infrastructure

Killbounce: Pros & Cons

✓Pros

Fast verification (1,000 emails in 60 seconds)
Affordable pricing ($4 per 1,000 addresses)
No subscription required
Credits never expire
Refund guarantee if verified address bounces
100 free credits to start (no card required)
Works with all major ESPs and marketing platforms
Three-layer verification catches dead addresses, risky addresses, and trap accounts
Results in seconds with minimal setup

Frequently Asked Questions about Killbounce

Does KillBounce integrate with Mailchimp, HubSpot, or my other email tools?

Yes. KillBounce has native integrations with Mailchimp, HubSpot, Salesforce, Brevo, SendGrid, Klaviyo, ActiveCampaign, Postmark, AWS SES, and automation platforms like Zapier, Make, and n8n. You can also export verified lists as CSV or use the API to build your own workflow.

What happens if an email I verified with KillBounce bounces anyway?

KillBounce refunds you for that verification. The guarantee protects you if an address it scored passes validation but later bounces in the wild, so you are only paying for addresses that actually work.

Can I verify multiple email list formats at once?

KillBounce handles CSV, TXT, XLS files and paste-in lists, and auto-deduplicates across more than 10 formats so you do not send duplicate verifications to the same address. You can verify up to 5 million addresses in a single job.

How does KillBounce score each email address?

It runs a three-layer check: syntax validation to catch malformed addresses, DNS and MX record lookup to confirm the domain exists, and a live mailbox probe that safely tests whether the address accepts mail. Each address gets a score from 0 to 100, and results come back in seconds.