Bulk email verification built for cold-email agencies — upload a client list, remove hard bounces, spam traps, catch-alls and disposables, and send clean. $0.003/email, no per-list setup, API included.
Cold-email agencies run many client campaigns from a shared pool of domains and IPs. Providers score bounces against that infrastructure — not per client. A single list with hard bounces, stale addresses or planted spam traps can drag down deliverability for every campaign you send.
That's why the best agencies treat verification as a per-campaign step, not a one-time audit. Run the list through BounceZero, remove what's bad, and you go into every send knowing the only thing on it is reachable addresses.
Verify your first client list freeThe same engine that powers our single-address API — scaled to multi-thousand-row client lists.
Addresses that don't exist anymore. The #1 deliverability killer, removed before your send.
Honeypot addresses planted in purchased and aged lists. One send to a trap is enough to flag a new domain.
Domains that accept everything and never read it. They inflate response-rate math and poison deliverability stats.
Temp-mail addresses that expire days later — dead weight for an agency delivering a response-rate guarantee.
info@, sales@, hello@ — usually unmonitored, rarely reply, and drag down open and reply metrics for your client.
Mail servers that silently drop. If the domain won't accept mail, the whole batch from it is worthless.
Drop a CSV of the list you're about to send to. One job per client, so you can run several campaigns in parallel.
Every address is checked in the background. No watching a spinner — go work on the sequence while it runs.
Get back the verified survivors plus a per-domain report showing exactly what was removed and why.
Re-import into your sending tool and go. Every address on the list is reachable — and your shared domains stay clean.
$0.003 per verified email. No per-list setup fee, no minimums, top up as you grow.
No credit card · Setup in 60 seconds · 100 free credits included
Bulk jobs run in the background while you work. Processing speed depends on list size and how many unique domains it contains, but you don't have to watch it — upload the list and come back to a clean, downloadable result with a per-domain breakdown.
Yes. Every bulk verification is also available through the BounceZero API, so agencies can wire verification directly into their pipeline or deliverable workflow instead of downloading and re-uploading CSVs by hand.
Cold-email agencies usually send multiple client campaigns from shared domains and IPs. A high bounce rate on one client's list is scored against that sending infrastructure — so a single bad list can trigger spam flags that damage every other client sharing it. Verifying before each campaign isolates that risk.
A clean, re-importable list plus a per-domain breakdown: hard bounces, unreachable or catch-all domains, disposable addresses, role accounts and spam-trap signals, so you know what was removed and why.
Verification is priced per email at $0.003. Plans start at 100 free credits per month, then $6 for 2,000, $15 for 5,000 and $30 for 10,000 credits — top up as you need more, with no per-list setup fee.