Clean your email list. Save your sender reputation.
A 3% bounce rate is enough for mailbox providers to start throttling you. Upload a CSV and we tell you which addresses are real, which are risky, and which will bounce. We email you when it's ready.
Valid
1620
Risky
180
Bouncing
200
Works with the senders you already use
Three steps. No setup.
You don't need to be technical. If you can drag a file onto a webpage, you can use ListBouncer.
Drop your CSV
Any column layout works. We find the email field automatically. No setup, no API keys, no integrations.
We verify every address
Live SMTP probes against each recipient's mail server. Disposable domains, role inboxes, catch-alls, and bounces all flagged.
Cleaner list, ready to download
We email you when verification finishes. Download the cleaned CSV from your dashboard, split into valid, risky, and bounce-likely buckets. Send with confidence.
Same engine. Better terms.
The verification logic is industry-standard. What we change is how it's priced, packaged, and presented.
Based on publicly listed offerings as of May 2026. We'll keep this honest.
No data resale
We never sell or share your addresses
Delete on demand
Wipe reports and addresses anytime
256-bit TLS
Encrypted in transit
No file storage
Your CSV is processed in memory, never written to disk
Whatever your sending looks like
Newsletter, outreach, lifecycle, re-engagement. The cost of a dirty list is the same. ListBouncer fits all of them.
Protect your sender reputation
If even 3% of your list bounces, mailbox providers start throttling you. Clean before you send.
Stop wasting send credits
Every bounced address you send to is a wasted credit on your outreach tool. Verify first, save money.
Trust the leads you pass on
Hand sales a list where every address actually exists. Fewer rep complaints, higher conversion.
Clean before you reactivate
Old lists rot up to 30% per year. Verify before you re-engage so dead addresses don't kill your domain.
Pay once. No subscription.
Pick the pack that matches your list size. Credits stay in your account forever. Try it free with 100 addresses, no card required.
100 addresses
Free
no card required
Included on every account
2,000 addresses
$9
one-time
$4.50 per 1,000
5,000 addresses
$19
one-time
$3.80 per 1,000
10,000 addresses
$35
one-time
$3.50 per 1,000
25,000 addresses
$69
one-time
$2.76 per 1,000
50,000 addresses
$119
one-time
$2.38 per 1,000
Bigger list? Email support@listbouncer.com for custom pack pricing.
Things people ask
How accurate is ListBouncer?+
We run live SMTP probes against each recipient's mail server, the same technique most verification services use. Accuracy is typically 96 to 99% for popular major providers like Gmail and iCloud. For providers that don't allow per-mailbox verification (such as Yahoo, Outlook, Hotmail, AOL, and most Google Workspace or Microsoft 365 domains), we layer additional logic and flag them in their own bucket so you don't get false-invalid results.
What happens to my list after verification?+
Your uploaded CSV is processed in memory and never written to disk. The per-address verdicts are stored in your account so you can re-download them; delete a report from your dashboard and those rows are wiped too. We don't sell or share addresses. Ever.
Why pay-once instead of a subscription?+
Most senders clean lists in bursts. Before a big send, after a long break, when re-engaging cold contacts. Subscriptions punish that pattern. Credits that never expire match how you actually work.
Do you handle disposable and catch-all addresses?+
Yes. Disposable domains like Mailinator, Guerrilla Mail, 10minutemail and about 3,500 others are flagged from a static list before we even probe. Catch-all domains are labeled separately so you can decide whether to keep or drop them.
What if some of my addresses come back as 'unknown'?+
'Unknown' covers addresses where the mail server didn't give us a definitive answer, usually Google Workspace or Microsoft 365 domains that block per-mailbox verification. Yahoo, Outlook, Hotmail, and AOL behave similarly, so they get their own 'major provider' bucket (likely deliverable, just unverifiable). Rather than guess and risk dropping real addresses, we surface both buckets honestly. Keep them if they're from recent sign-ups, or drop them if you want to be conservative. Your call.
Ready to clean your list?
Start with 100 free addresses. No credit card, no subscription. Drop a CSV and see what comes back.
Try free with 100 addresses →