Send only to addresses that answer.
BonVerify checks every address against the mailbox itself, then tells you which ones will bounce, which are traps, and why — before your next send.
48,210 addresses
run 09:41 · 6.2s
Sample
Ready to export
91% deliverable · 1,204 traps removed
Bounce risk on next send: 0.4%
The dashboard
Every list, run and verdict in one place
Upload, run, inspect and export from one screen. Every address keeps the reason it was scored the way it was.
1,284
Lists verified
91%
Deliverable
9,412
Traps removed
Lists · Every batch
One verification engine
Everything a list needs before it ships
Stop sending and hoping. BonVerify checks every address against the receiving mailbox, explains each verdict, and hands back a list you can send to without holding your breath.
A live mailbox probe
We resolve the domain, find its mail exchangers and ask the receiving server whether the mailbox exists — then hang up. Nothing on your list is ever sent a message.
Traps and disposables
Pristine and recycled traps, plus throwaway providers, reported apart from ordinary invalids.
Catch-all detection
Domains that accept everything are flagged risky, not passed off as clean.
A reason on every address
Not just a verdict — the sentence that produced it, so a disputed result can be traced.
Verify on write
One API call, about 300ms — fast enough to run inside a signup form.
Scheduled re-runs
Lists decay about 2% a month. Re-verify on a clock and catch it before a send does.
We ask the mailbox, we do not guess
Most tools score an address on how it looks. BonVerify resolves the domain, finds its mail exchangers and opens an SMTP conversation with the receiving server — then hangs up before anything is delivered.
- Syntax, domain and MX resolution
- Live SMTP mailbox probe
- No message ever reaches the address
6.2s
to verify 50,000 records
Four answers, and the reason for each
Deliverable, risky, invalid, unknown — and every address carries the sentence that produced it. A disputed result can be traced instead of argued about, which is the difference between a tool you trust and one you second-guess.
- Catch-all and role-account detection
- Spam traps and disposable providers
- Unknown is requeued, and never billed
0.4%
median bounce after a run
Clean on the way in, not just before a send
Batch a CSV when you need to, but the addresses that hurt most are the ones you are still collecting. Verify at the point of signup in about 300ms, and re-run the whole list on a schedule to catch decay.
- Single-address API, ~300ms
- Webhooks on verified and completed
- Scheduled re-verification every 90 days
~300ms
inside a form submission
Your list is the thing we are most careful with
Contact records are the one thing you cannot re-collect if they leak. Yours are processed to answer your run, kept for the window you set, and never pooled with anyone else’s.
Your list is never the product
Uploaded addresses are used to answer your run and nothing else. They are never sold, appended to, or added to a shared pool.
Deleted when you say so
Set a retention window per list, or purge on completion. Records are removed from primary and backups on the same clock.
Every verdict is explainable
Each address carries the reason it was scored the way it was, so a disputed result can be traced rather than argued about.
We never send mail
Verification is an SMTP conversation that stops before delivery. Nothing on your list ever receives a message from us.
4.1B
addresses verified to date
0.4%
median bounce rate after a run
6.2s
to verify 50,000 records
99.99%
API uptime, last 12 months
One run
48,210 addresses, 6.2s
Q3_Newsletter_Master.csv
91%
deliverable
- Deliverable
- 43,870
- Risky
- 2,914
- Invalid
- 1,301
- Unknown
- 125
Q3 Newsletter
Webinar Signups
Marketing Contacts
Cold Outreach
Product Updates
Checkout API
Trade Show
Renewals 2026
Clean rate by list, most recent eight. Anything under 60% is a list worth looking at before it ships.
Drops into the stack you already trust
Read a list straight out of the tool that holds it, write the verdicts back, and keep both in step on a schedule. No export, no re-import, no rip and replace.
40+
native integrations, growing every month
Used by teams who send for a living
Lifecycle, growth and deliverability teams run their lists through BonVerify before every send.
“Our bounce rate went from 6% to under half a percent on the first send after a run. The part that sold the team was the reason column — we could see exactly what was wrong.”
Adaeze Nwankwo
Head of Lifecycle, Ledgerpoint
“We wired the API into the signup form. Bad addresses never enter the database now, so there is nothing to clean up later.”
Marcus Feld
Growth Lead, Atlas Commerce
“It caught 1,204 traps in a list we had been mailing for a year. That alone paid for it.”
Priya Anand
Deliverability Manager, Northwind
“Unknown results are requeued instead of billed as invalid. That one decision is why the numbers match our own bounce logs.”
Dr. Elias Vogt
Data Platform Lead, Vireo Health
Pricing that scales with your list
Start free on your first list. Pay for verdicts returned — unknowns are requeued and never billed.
Starter
For a single list, cleaned before a send.
- 5,000 verifications a month
- CSV upload and export
- Syntax, domain and mailbox checks
- Deliverable-only export
Team
Most popularFor teams verifying continuously, in batches and on write.
- Unlimited verifications
- API and webhooks
- Trap and disposable detection
- Scheduled re-verification
- SSO and SAML
Enterprise
For senders with volume, and a reputation to protect.
- Dedicated verification capacity
- Custom retention windows
- SSO and audit export
- Dedicated support
Questions
Answers for the security-minded
Still evaluating? Our team replies within one business day, and every plan includes real human support.
We resolve the domain, look up its mail exchangers, open an SMTP conversation with the receiving server and ask whether the mailbox exists — then hang up before any message is delivered. Nothing on your list ever receives mail from us.
Send your next campaign like it matters
Set up in minutes, no card. Upload a list, get a verdict and a reason for every address, and export what is safe to send.