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BounceZero

Verify emails that actually deliver.·bouncezero.io·GitHub

Usage-based · Free plan See pricing ↓

BounceZero is an email verification service that checks whether email addresses are valid and deliverable before sending. It runs each address through a five-stage pipeline (syntax, DNS/MX, SMTP handshake simulation, social signals, and historical domain data) combining 65+ signals with Bayesian and machine-learning scoring. It detects invalid addresses, disposable emails, catch-all domains, spam traps, and role-based addresses, and offers a dashboard, REST API, and bulk CSV processing.

What it's for

Verify email addresses before sending campaignsClean email lists in bulk via CSV uploadDetect disposable, role-based, and catch-all email addressesReal-time verification via API and webhooks at signupAutomatically remove or flag bad contacts in ESPs/CRMs via list-cleaner integrationsFeed verified contacts to Google Ads Customer Match

Features 19

65+ verification and metadata fields per check
API key dashboard with usage analytics
Bayesian + ML blended scoring engine
Bulk CSV verification (up to 1,000,000 addresses per dashboard job; up to 2,000,000 rows / 200MB per API upload)
Catch-all domain 3-probe detection
Certificate Transparency log analysis
Disposable email address detection
Domain intelligence (SPF, DKIM, DMARC, BIMI, MTA-STS, DANE, WHOIS, domain age)
Five-stage verification pipeline (syntax, DNS/MX, SMTP, social signals, historical domain data)
Free single-address email verifier tool
List-cleaner scripts and webhook handlers for 24+ platforms
Native HubSpot integration
Plain-English explanations for verification scores
REST API with 30+ endpoints
Role-based address detection
SMTP handshake verification with greylisting auto-retry
Social and digital footprint checks (Gravatar, breach database cross-reference, developer profile lookup)
Spam trap detection
Webhook notifications for async bulk jobs

At a glance

free tierfree trialAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

Formarketers, agencies, developers, teams that can't afford bounces

CompanyBounceZero Ltd · 2026

Integrations

Constant ContactShopifyGoogle AdsAWeberDripWooCommerceOmnisendCustomer.ioLoopsMoosendActiveCampaignIntercomConvertKitBrevoWordPressGhostMailerLiteIterableHubSpotMailchimpn8nPrestaShopMake.comCampaign MonitorZapierKlaviyoBeehiivSendGridGetResponse

Complianceself-reported

GDPRICO RegistrationCSA STAR Level 1UK GDPR

Resources

Pricing

Credits are purchased as one-time, non-expiring packs; the vendor states there are no subscriptions or monthly fees. Every new account also receives 100 free verification credits each month at no cost, with no credit card required. The Custom/Enterprise tier is priced by quote via Contact Sales. A 30-day refund policy applies to unused credits.

FreeFree

Recurring monthly free allowance, not a one-time purchase.

100 free verification credits every month, no credit card required

StarterQuote