Clean an entire list in minutes
Upload a CSV and verify thousands of contacts at once — emails verified, phones validated, duplicates removed — then download a clean, ready-to-send file.
How bulk verification works
What you can clean
Bulk verification is built for the lists that accumulate everywhere in a business, the ones most likely to have quietly decayed since you last looked at them.
Built for big lists
Whether it's a few hundred contacts or tens of thousands, bulk verification runs the same deep checks on every row — syntax, domain, MX, mailbox, catch-all, disposable and role detection — and hands back a file you can send or import with confidence. There's no quality trade-off for size; row one and row fifty-thousand get the same treatment.
Every row comes back annotated with its status, so you're not just handed a shorter list — you can see exactly why each address was kept, flagged or removed, and apply your own rules to the borderline cases.
Deduplication that catches hidden duplicates
Duplicates are the silent tax on a list: they inflate your counts, double your sending cost to the same person, and can trigger complaints when someone gets the same email twice. The tricky ones aren't exact matches — they're the same contact entered with different capitalisation, spacing or formatting that a simple spreadsheet de-dupe misses.
Bulk verification normalises and deduplicates as part of the same pass, so the clean file you download reflects real, unique people — not the same contact counted three times.
The quality score: judge a list at a glance
Every bulk run returns a 0–100 quality score for the whole list, not just per-address statuses. That single number tells you instantly whether a list is healthy enough to send to, needs a clean first, or should be approached with real caution.
It's especially useful for lists you didn't build yourself. Before you trust a purchased or inherited file, the score gives you an honest read on what you're actually working with — and you can see it on the free 100-row preview before paying anything.
Phone and company in the same upload
Because BounceBlock isn't email-only, a single bulk upload can verify emails, validate phone numbers (line type, carrier and status) and check company data all at once. For teams that call, text and email, that means one clean file covers the whole outreach instead of running three tools and reconciling the results.
It also keeps your record consistent: the same contact is verified across every channel in one pass, so 'clean' means the same thing whether a rep is about to email, call or text them.
Flat pricing for regular cleaning
Because pricing is flat — not per-verification credits — you can verify before every campaign instead of rationing checks to save money. That matters more than it sounds: credit-metered tools subtly discourage the exact habit that keeps a list healthy, because every clean visibly spends a balance you paid for.
With a flat monthly allowance, cleaning often is free of that friction. Verify a list before each send, re-check anything that's aged, and never do the credit math — the behaviour that protects your deliverability is the one the pricing encourages.
Reading your cleaned file
A bulk clean doesn't just hand back a shorter list — it hands back a more informative one. Every row in the downloaded file is annotated with its status, so you can see at a glance which addresses are valid, which were removed as invalid, which are catch-all, and which were flagged as risky for being role-based or disposable. Nothing is silently deleted out from under you.
That transparency lets you make your own calls on the borderline cases. Some teams drop every catch-all; others keep the ones at target-account domains. Some exclude role accounts like info@ entirely; others keep them for account-level communication. Because the status travels with each row, you can apply your own rules rather than accepting a one-size-fits-all cut — and you keep an audit trail of why each contact was treated the way it was.
How often to run a bulk clean
Contact data decays continuously — industry estimates put it at roughly 2–2.5% a month — so a single clean is a snapshot, not a solution. The teams with the healthiest lists treat bulk verification as a recurring habit tied to the moments that matter most, rather than a once-a-year spring clean.
A sensible rhythm is to verify any list before a major campaign, re-clean your core database at least quarterly, and always clean a purchased, event or inherited list the moment it arrives and before its first send. Because flat pricing removes the per-check cost, there's no financial reason to stretch those intervals — you can clean as often as the data's age warrants.
The cost of skipping it compounds quietly. A list that was clean two quarters ago can easily have drifted past a safe bounce rate without anyone noticing, and the first sign is often a deliverability drop that's already underway. Regular cleaning keeps that from ever starting.
Bulk verification versus cleaning by hand
It's tempting to think a careful person with a spreadsheet can do the same job for free, but the two aren't comparable. A spreadsheet can only see the text of an address — it can't confirm that a domain has mail servers, that a mailbox exists, or that a number is connected. It will happily pass a perfectly formatted address that bounces on the first send.
Manual cleaning also misses the duplicates that matter most: the same contact entered with different capitalisation or spacing, which look distinct to a human skimming rows. And it simply doesn't scale — scrubbing tens of thousands of contacts by hand is hours of work that still can't answer the deliverability question. Bulk verification does in minutes what manual review can't do at all, and hands back a file you can actually trust.
What a healthy quality score looks like
The 0–100 quality score is designed to give you a fast, honest verdict on a list before you commit to sending. A high score means the large majority of addresses are valid and low-risk — the list is in good shape and safe to send. A middling score signals meaningful invalid, catch-all or risky content that's worth cleaning before a campaign. A low score is a warning that sending as-is would likely spike bounces and put your reputation at risk.
What makes the score useful is that it's calculated on the same deep checks applied to every row, so it isn't a vague estimate — it reflects the real composition of your file. For lists you didn't build yourself, that's invaluable: before you trust a purchased or inherited list, the score on the free 100-row preview tells you honestly what you're working with, so you can decide whether to send, clean, or walk away.
Bulk verification for agencies and client lists
Agencies live and die by the quality of the lists they're handed, often with no control over how those lists were built. A new client arrives with a CRM export of unknown age and provenance, and sending to it blind risks the agency's own sending reputation as much as the client's. Bulk verification turns that unknown into a known quantity in minutes.
Running every client list through a clean before the first campaign protects the agency on two fronts: deliverability stays high, and the annotated results give a clear, defensible story about list quality to share with the client. The flat-pricing model fits this pattern especially well, because an agency cleaning many lists across many clients isn't penalised per check — verifying every list, every time, costs the same as verifying one.
Before a big send: the pre-flight clean
The single highest-leverage moment to run a bulk verification is right before a large or important send. A campaign to a big list is exactly when a hidden pocket of invalid addresses does the most damage, because the bounce spike hits all at once and the reputation cost lands across your whole sending — not just the campaign in question.
A pre-flight clean removes that risk for the price of a few minutes. Upload the segment you're about to mail, let it verify and dedupe, and send to the cleaned file instead. It's a small, repeatable habit that quietly prevents the kind of reputation damage that takes weeks to recover from — the cheapest insurance in email marketing.
Ready to see what’s hiding in your list?
Upload a file and preview your first 100 verifications free — email and phone, in one pass.
Frequently asked
What file formats do you accept?
CSV exports from any CRM, spreadsheet or email tool. We auto-detect your email, phone and company columns on upload, so there's no rigid template to match.
How long does bulk verification take?
You can preview the first 100 rows in about two minutes. Full lists process in minutes for most sizes; very large lists take a little longer but run the same deep checks on every row.
Is there a limit on list size?
Bulk verification handles everything from a few hundred contacts to tens of thousands in a single upload. Your monthly allowance is set by your plan, not by per-list credits.
Does it remove duplicates and validate phones too?
Yes — deduplication runs as part of the same pass, including the reformatted duplicates a spreadsheet misses, and phone numbers are validated alongside email in the same upload.
Can I see results before I pay?
Yes — every upload previews the first 100 rows free, with a full quality score and per-row statuses, so you can judge results on your own data before committing. No credit card is needed for the preview.
What does the cleaned file include?
A row for every contact annotated with its status — valid, invalid, catch-all or risky — plus phone line type and any company data, with duplicates removed. Nothing is silently dropped, so you keep full visibility into why each contact was kept or flagged.
How is it priced?
One flat monthly subscription covering email, phone and company verification together — no per-verification credits to track.
Is my data safe?
Your uploaded data is encrypted and permanently deleted within 24 hours. We never sell or share it, and we're built to be GDPR-friendly.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.