New domains are fragile. Three bad sends in week one and your domain is blacklisted before it even warmed up. BounceZero is the fastest way to protect a new sending domain.
100 free verifications every month. No credit card required.
Email verification for B2B startups isn't optional hygiene - it's domain survival. A brand-new domain has zero reputation buffer. Every hard bounce counts against you from send #1.
Established senders can absorb the occasional bounce. A domain registered last month cannot. Gmail and Outlook flag new domains that bounce above 2% almost immediately - and warming a blacklisted domain back up takes months you do not have.
Most early-stage outreach lists come from scrapers, databases, or founder networks. B2B email addresses decay at roughly 22% per year - people change jobs constantly. That "fresh" export is already full of dead mailboxes.
Around 23% of B2B domains are catch-all: they accept every address, then bounce or silently drop later. Cheap verifiers mark these "valid" and move on. Our 3-probe catch-all detection tells you which ones will actually land.
Every address on your outreach list runs through the full BounceZero pipeline - with 99.8% accuracy against an industry benchmark of ~95%.
We connect to the mail server and confirm the exact mailbox exists - not just the domain. Dead prospects never reach your sequence.
Triple-probe testing separates real mailboxes from catch-all noise on the ~23% of B2B domains that accept everything.
info@, sales@ and support@ addresses tank cold outreach reply rates and trigger spam complaints. We flag them so you can target humans.
Temporary inboxes from signup forms and lead magnets are caught before they pollute your CRM and your sender stats.
Domains with broken or missing mail servers guarantee a hard bounce. We catch them at the DNS layer in milliseconds.
One spam trap hit can blacklist a new domain overnight. Our screening flags known and suspected traps before you ever send.
Built for founder-led outreach: no onboarding calls, no sales demos, no minimum contracts. Sign up and clean your first list in under ten minutes.
Sign up at app.bouncezero.io - 100 free verifications every month, no credit card required. Enough to test your list quality before spending a cent.
Drag in a CSV straight from Apollo, LinkedIn Sales Navigator, Clay, or your CRM export. Bulk handles up to 500K emails per batch - 10K emails process in 5-10 minutes.
Mailbox existence, 3-probe catch-all, role, disposable, MX, and spam trap screening - every email scored and classified at 99.8% accuracy.
Export deliverable, risky, and invalid segments separately. Load only the deliverable segment into your sequencer and expect under 0.5% bounces.
Once outreach scales, verify at capture time with our real-time API - 340ms average response - so bad emails never enter your pipeline again.
$3 per 1,000 verifications. Pay as you go, no subscriptions, no minimums - because pre-seed budgets are real.
Volume discounts kick in automatically as you scale. No seats, no tiers, no annual lock-in - credits never expire, so verify when you actually have a list to send.
Straight answers from a team that's warmed a few domains of its own.
A new sending domain has no reputation history, so mailbox providers judge it entirely on early behavior. If your first sends bounce above 2%, Gmail and Outlook throttle or block you almost immediately - and recovering a blacklisted domain takes months. Verifying your list first keeps bounces under 0.5%, which reads as a trustworthy sender.
Prospecting databases verify emails when they collect them, not when you export them. B2B addresses decay at roughly 22% per year as people change jobs, so a meaningful share of any export is already dead. BounceZero verifies each address live, at send time, with real SMTP-level checks.
About 23% of B2B domains are catch-all - they accept mail for any address, valid or not. Most verifiers give up and mark them "unknown" or worse, "valid". BounceZero runs a 3-probe catch-all detection process to determine whether the specific mailbox actually exists, so you can make an informed send/skip decision.
Pricing is $3 per 1,000 verifications, pay-as-you-go with no subscription. Every account also gets 100 free verifications per month with no credit card required - enough to sample your list quality before committing.
Bulk jobs process 10,000 emails in about 5-10 minutes, with support for batches up to 500,000. If you verify at capture time instead, the real-time API averages 340ms per lookup - fast enough to sit inline in a signup or enrichment flow.
Yes. The BounceZero API returns a full verdict - deliverability, catch-all status, role/disposable flags, and a confidence score - in a single call averaging 340ms. Most teams integrate it in under an hour; see the API docs for code samples.
99.8% accuracy. $3 per 1,000 verifications. Results in seconds. Verify your outreach list before you send - your six-month-older self will thank you.
100 free verifications/month - No credit card - Cancel nothing, because there's no subscription
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