Verify a Donor List in two minutes
A donor list is the lifeline of a nonprofit's appeals, and it degrades silently as supporters move and change contact details. Verifying before an appeal protects both your deliverability and the response rate that funds your mission — a bounced appeal is a donation that never had the chance to happen.
What's hiding in your list
Donor records often span many years, so a meaningful share have moved or abandoned the address on file.
Appeals go to the full list at once, so undeliverable records can spike bounces right when your campaign needs to land.
Limited budgets make wasted sends and damaged deliverability especially costly for nonprofits.
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
Protect deliverability so appeals get seen. 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
Why verify a donor list before an appeal?
It keeps your appeal out of spam and in front of supporters who can actually give — protecting both reputation and response rate.
Is BounceBlock affordable for nonprofits?
Pricing is a flat monthly subscription with no per-verification credits, so regular list hygiene stays predictable and budget-friendly.
Can I verify donor phone numbers for a call campaign?
Yes — email and phone are validated together, so phone-a-thon lists reach connected numbers.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.