One hard bounce spike and your ESP flags you as a potential spammer. BounceZero removes the invalid subscribers that accumulate between issues - keeping your list clean and your deliverability high.
100 free verifications every month. No credit card required.
Roughly 22% of email addresses go bad every year - people change jobs, abandon inboxes, and mistype signups. Every issue you send to a stale list chips away at your sender reputation.
Most ESPs flag accounts that exceed a 2% bounce rate. One send to a decayed list can put your account under review - or get your sending paused mid-campaign.
Abandoned addresses get recycled into spam traps. Hit one and mailbox providers start routing your entire newsletter to spam - even for engaged subscribers.
Invalid addresses inflate your list size and drag open rates down. Low engagement signals tell Gmail and Outlook your content belongs in Promotions - or worse.
Each email on your list passes through a full verification pipeline - not just a syntax check. up to 99.8% accuracy in internal testing on SMTP-verifiable addresses, results in seconds.
We connect to the receiving mail server and confirm the inbox actually exists - before your newsletter bounces off it.
Catch-all domains accept everything, then silently drop mail. Our 3-probe method identifies real inboxes behind catch-all servers.
Recycled and pristine spam traps are flagged before they poison your sender reputation with Gmail, Outlook, and Yahoo.
Temporary inboxes from throwaway services sign up for lead magnets, then vanish. We catch them so they never inflate your list.
Addresses like info@ and admin@ rarely engage and often mark newsletters as spam. We flag them so you can segment or suppress.
Domains with missing or dead mail servers are guaranteed hard bounces. We verify MX records so those addresses never reach your ESP.
From export to re-import in under 15 minutes. Run it before every major send, or monthly for lists that grow daily.
Download your list as CSV from Mailchimp, beehiiv, ConvertKit, Substack, or any ESP.
Drag and drop your CSV. Up to 1,000,000 addresses per dashboard job - most newsletter lists finish in 5-10 minutes.
All 6 checks run on each subscriber: mailbox, catch-all, spam trap, disposable, role, and MX.
Get your list split into valid, invalid, and risky. Keep the valid, suppress the rest.
Add real-time verification to your signup form - provider-dependent response times stop bad addresses at the source.
At $3 per 1,000 verifications, cleaning a 10,000-subscriber list costs $30. Compare that to rebuilding a sender reputation from scratch.
Pay as you go. No subscriptions, no minimums, credits never expire.
Everything newsletter operators ask before their first clean.
Every 3 months for actively growing lists, and always before a major send to a segment you haven't emailed in 60+ days. Email addresses decay at roughly 22% per year, so a list left unverified for six months can carry 10%+ invalid addresses.
Yes, in two ways. Removing dead addresses immediately corrects your open rate math, and lower bounce rates improve inbox placement over time - so more real subscribers actually see your issues in the primary inbox.
Typically 5-10 minutes for lists up to hundreds of thousands of emails. BounceZero supports dashboard jobs up to 1,000,000 addresses, so even large newsletters finish in a single upload with no splitting required.
Don't delete them outright. Move risky addresses to a separate segment and send to them from a warmed domain at lower volume, or re-confirm them with a one-click opt-in campaign. Around 23% of B2B domains are catch-all, so this segment can hold real readers.
Yes. Connect the BounceZero API to your signup form and every new subscriber is verified in real time - response time varies by provider and verification path, fast enough that signups feel instant while typos and disposable addresses are rejected on the spot.
No. Verification happens at the mail-server level using SMTP-layer checks - no email is ever delivered to your subscribers, and they never know a check happened.
Verify your first 100 subscribers free every month. No credit card, results in seconds - and your ESP never sees another bounce spike.
Start Verifying Freeup to 99.8% accuracy in internal testing on SMTP-verifiable addresses - $3 per 1,000 verifications - 100 free/month
Tailored use cases across teams and sectors
Every rep sends on clean data - protect quota
Deliver verified emails, retain clients longer
Verify guest lists - protect save-the-date deliverability
Protect a new domain from the first send - API + bulk guide
ICP by segment, CTO/CISO/RevOps templates, 5-touch sequence, deliverability setup
Block disposable signups, protect trials, fail-open API integration, role address handling
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