ZeroBounce

What ZeroBounce is

ZeroBounce is an email verification and deliverability platform built to help businesses clean their email lists, protect sender reputation, and land more messages in the inbox instead of spam. At its core is a bulk and real-time email validation engine that checks syntax, domain, mailbox existence, and catch-all status, with ZeroBounce advertising 99.6 percent validation accuracy and one of the lowest unknown-result rates in the category at 1.75 percent. What separates ZeroBounce from a plain syntax checker is its AI angle: an AI-powered Email Scoring engine rates ambiguous catch-all addresses on a 1 to 10 scale based on historical engagement patterns, giving marketers a usable signal even when a mailbox cannot be verified with certainty.

Beyond validation, ZeroBounce has expanded into a broader deliverability suite, including an Email Finder for B2B contact discovery, Email Activity Data that shows engagement over the last 30 to 180 days, Inbox Placement Testing across major mailbox providers, Email Server Testing for SPF, DKIM, and DMARC configuration, a dedicated DMARC Monitor, 24/7 Blacklist Monitoring across 200-plus spam databases, and an Email Warmup tool to build domain reputation before sending. The platform is fully web-based with a REST API supporting 16 programming languages, and connects to over 60 integrations including Zapier, an official Salesforce AppExchange app, HubSpot, Mailchimp, and Klaviyo, making it straightforward to plug validation into an existing marketing or sales stack rather than running exports and imports manually.

Where ZeroBounce is the strongest pick

Marketers and sales teams who need to clean large contact lists before a campaign or CRM import, and want AI-assisted scoring for ambiguous catch-all addresses rather than a blunt valid or invalid verdict

Pricing

Free tier: 100 free validation credits per month on every account, plus 1 inbox placement test, 1 email server test, 1 blacklist monitor scan, and 10 email finder searches. Credits never expire.

• Free: $0 (monthly). 100 validation credits/month, 1 inbox placement test, 1 email server test, 1 blacklist monitor, 10 email finder searches.
• Pay-As-You-Go (2,000 credits): $39 (one-time credit pack). 2,000 validation credits at roughly $0.0195/credit, never expire, scales to lower per-credit rates at higher volumes up to 1,000,000+ credits.
• ZeroBounce ONE (monthly): $99/mo (monthly). 10,000 validation/scoring credits per month, activity data, premium API rate limits, 24/7 VIP support, credits roll over.
• ZeroBounce ONE (annual): $79/mo (annual). Same as monthly ZeroBounce ONE plan at 10,000 credits/month, billed annually for a lower effective rate.
• Enterprise: Custom (custom). Volume pricing above 1,000,000 credits/month, dedicated account support, custom SLAs.

Pricing verified June 2026 from the official site. Confirm current pricing before purchase.

Best for

Email marketers, growth teams, and sales operations that send high volumes of outbound or newsletter email and need list hygiene plus deliverability monitoring in one platform

Key features

• Bulk and real-time email validation with 99.6% accuracy guarantee
• AI-powered Email Scoring (1-10 rating) for catch-all addresses
• Email Finder for B2B contact discovery with instant verification
• Email Activity Data showing 30-180 day engagement history
• Inbox Placement Testing across major mailbox providers
• Email Server Testing for SPF, DKIM, and DMARC setup
• 24/7 Blacklist Monitoring across 200+ spam databases
• Email Warmup to build sender domain reputation

Pros

• High advertised accuracy (99.6%) with low unknown-result rate
• AI scoring adds a usable signal for catch-all addresses instead of a flat unknown verdict
• Broad deliverability toolkit beyond validation: DMARC, blacklist, warmup, inbox placement
• Credits never expire and roll over on subscription plans
• 60+ integrations including official Salesforce and Zapier apps

Cons

• Entry-level pay-as-you-go pricing (about $0.02/credit at minimum pack) is pricier per email than some competitors at low volume
• Email Finder credits (20 per search) are expensive relative to dedicated prospecting tools
• Full deliverability suite is most valuable at the ONE subscription tier, less so for occasional PAYG users
• No published refund or accuracy guarantee policy on the standard pricing page

Best-fit use cases

• Cleaning a purchased or aged email list before a cold outreach or newsletter campaign
• Validating signups in real time at the point of form submission via API
• Monitoring domain blacklist status and DMARC compliance before a major send
• Scoring catch-all business addresses to prioritize high-probability contacts
• Finding and verifying B2B contact emails for sales prospecting

FAQ

How much does ZeroBounce cost?

ZeroBounce uses credit-based pricing. Pay-as-you-go starts around $39 for 2,000 credits (about $0.0195 each), with the per-credit rate dropping at higher volumes. The ZeroBounce ONE subscription starts at $99 per month for 10,000 credits, or $79 per month if billed annually. Enterprise volume above 1,000,000 credits uses custom pricing.

Is ZeroBounce free?

ZeroBounce has a free tier: every account gets 100 validation credits per month at no cost, plus one inbox placement test, one email server test, one blacklist monitor scan, and 10 email finder searches. Credits never expire, but heavier usage requires a paid pay-as-you-go pack or ZeroBounce ONE subscription.

What is ZeroBounce AI email scoring?

AI Email Scoring is ZeroBounce's machine-learning feature that rates catch-all email addresses on a 1 to 10 scale based on historical engagement and deliverability patterns. Catch-all addresses cannot be verified with certainty by standard validation, so the AI score gives marketers a usable risk signal instead of a flat unknown result. One credit scores one address.

How accurate is ZeroBounce?

ZeroBounce advertises a 99.6 percent validation accuracy guarantee, with what it describes as one of the industry's lowest unknown-result rates at 1.75 percent. Accuracy applies to its real-time and bulk validation engine, which checks syntax, domain, mailbox existence, and catch-all status.

Does ZeroBounce integrate with my CRM or email platform?

Yes. ZeroBounce offers 60-plus integrations, including an official Salesforce AppExchange app, a Zapier connection, and direct integrations with HubSpot, Mailchimp, and Klaviyo. A REST API is also available, documented across 16 programming languages, for teams that want to validate emails directly inside their own workflow.