Pre-campaign Verification in two minutes
Verifying your list immediately before a campaign send is the last line of defense against deliverability failures that earlier hygiene passes might have missed — addresses that became invalid after your last bulk clean, catch-all domains that changed their configuration, or new contacts added to the segment without going through a validation step. The closer the verification is to the send time, the more accurate the results, since every day between verification and send is an opportunity for address state to change.
What's hiding in your list
Campaign timelines are often compressed, and pre-campaign verification gets scheduled late — then squeezed out entirely when a deadline moves up, leaving an unverified list going to a high-stakes send.
Large campaigns may consist of multiple segments sourced from different systems (CRM, MAP, manual additions), and it is common for the manually-added segment to bypass the verification step that other segments go through.
Segments defined by engagement criteria ("opened in last 90 days") feel safe to skip verification because recent activity implies deliverability, but even recently-active addresses can be associated with catch-all domains where a bounce is possible.
Email and phone — cleaned in one pass
Verify in one pass
Every email checked for deliverability and every phone validated — in a single upload.
Catch what others miss
Typos, catch-all domains, disposable addresses, dead numbers and silent duplicates.
Flat, simple pricing
Verify the list right before you launch. No per-credit math, no surprise overage bills.
Clean leads in three steps
No setup, no integrations, no learning curve. Upload a file, download a better one.
Upload your CSV
Drag in any contact list. We auto-detect email, phone, name and company columns.
We verify everything
Every email checked for deliverability, every phone validated, duplicates flagged — with a live quality score.
Download clean leads
Export a verified, deduplicated list your team can actually call and email.
Email and phone, cleaned in a single upload — see exactly how many bad contacts are hiding in your list before you pay a cent.
100 free verifications · no credit card · results in under 2 minutes
Frequently asked
How soon before a send should I verify my campaign list?
Verification within 48 hours of send is the practical ideal — it is close enough to send time that the results are current, while still leaving enough time to process the results and update your suppression list before the campaign launches.
Do I need to re-verify contacts I already verified during the CRM cleanup two months ago?
For a high-stakes campaign (a large launch, a re-engagement effort, a domain-warming sequence), yes — two months is enough time for a non-trivial number of addresses to decay, particularly in a B2B list where job changes are the primary driver.
How quickly can BounceBlock turn around a pre-campaign verification?
Processing speed depends on list size and SMTP verification complexity, but for typical campaign-sized segments of a few thousand to tens of thousands of records, results are generally available within minutes to a couple of hours — well within most pre-send workflows.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.