Nonprofits use case
Clean donor lists and protect your sender reputation on a tight budget
Nonprofits run on email — appeals, receipts, event invites, advocacy alerts — usually with a small team and a smaller budget. Dirty lists from petitions, event signups, and years of donor data quietly wreck deliverability, so fundraising emails stop reaching the inbox. Verifly cleans those lists with pay-as-you-go credits that never expire, so hygiene fits your budget instead of fighting it.
curl -X GET "https://verifly.email/api/v1/verify?email=supporter@example.com" \
-H "Authorization: Bearer vf_your_api_key"Real-time SMTP mailbox checks
Single, batch, and async bulk verification
Disposable, role account, and catch-all detection
Pay-as-you-go credits with no subscription lock-in
Search fit
Built for nonprofit donor list hygiene and deliverability
Use Verifly when you need a simple API, predictable pricing, and clean JSON results before emails hit your product, CRM, or campaign tool.
Dirty lists quietly starve your fundraising
Nonprofit email lists are assembled from the messiest sources imaginable: online petitions where people sign in seconds, event RSVPs collected on a clipboard and keyed in later, donation forms filled on a phone, and donor records that have aged for years as people change jobs and addresses. The result is a list riddled with typos, dead mailboxes, disposable addresses, and role inboxes. When you send your year-end appeal to that list, a wave of bounces tells Gmail and Outlook that you mail bad data — and they respond by routing more of your mail to spam.
For a nonprofit that damage is severe, because email is often the highest-ROI fundraising channel you have and you cannot buy your way out of a spam-folder problem. Verifly returns a clear deliverable, undeliverable, or risky verdict for every address, so you can suppress the bounces before they ever leave and keep your appeals landing in the inbox where they raise money.
Hygiene that respects a tight budget
Most list-cleaning tools want a monthly subscription whether you send once a quarter or every day. That math does not work for a nonprofit whose email volume spikes around a handful of campaigns a year. Verifly is pay-as-you-go: you buy credits, they never expire, and you only spend when you actually clean a list. Register once for 100 free credits to test it on your riskiest segment, then top up only when a campaign is coming.
The workflow is simple. Verify petition and event signups as they come in so junk never enters your CRM, and run your full donor file through the async bulk endpoint before each major send. Verifly flags disposable and role addresses too, so the vanity signups and shared inboxes that inflate your list without ever giving get pulled out before they hurt your numbers or your reputation.
- Register for 100 free credits — enough to clean a risky segment before spending anything.
- Call GET /verify?email= on petition, event, and donation form submissions as they arrive.
- Flag and suppress disposable and role addresses that pad the list without engaging.
- Before each appeal, run the full donor file through POST /verify/batch or the async bulk job.
curl -X POST "https://verifly.email/api/v1/verify/batch" \
-H "Authorization: Bearer vf_your_api_key" \
-H "Content-Type: application/json" \
-d '{"emails":["donor1@example.com","donor2@example.com"]}'FAQ
Frequently asked questions
Why do nonprofit email lists get so dirty?
They come from the messiest sources: petitions signed in seconds, clipboard event RSVPs keyed in by hand, phone donation forms, and donor records that age for years. That mix produces heavy rates of typos, dead mailboxes, disposable addresses, and role inboxes — exactly the data that causes bounces.
How does list cleaning protect our sender reputation?
Bounces are one of the strongest negative signals to mailbox providers. When your appeals bounce, Gmail and Outlook start routing your mail to spam — even for engaged donors. Removing undeliverable addresses before you send keeps your bounce rate low and your appeals in the inbox, which directly protects fundraising revenue.
Is Verifly affordable for a small nonprofit?
Yes. It is pay-as-you-go from $2 per 1,000 verifications down to $0.60 per 1,000 at the largest pack, and credits never expire. There is no monthly subscription, so you only spend when you actually clean a list — which fits a nonprofit’s handful of campaigns a year.
Can I verify petition and event signups as they come in?
Yes. A real-time GET /verify?email= call checks each signup at the point of entry, so junk and disposable addresses never enter your CRM in the first place, keeping the list clean at the source.
Can I clean my whole donor file at once?
Yes. Submit the file to the async bulk endpoint, which handles up to 1,000,000 addresses per job, to strip undeliverable and risky addresses before a year-end or emergency appeal.
Do we need a developer to use Verifly?
Not necessarily. You can self-register a key and get 100 free credits, and the endpoints are simple enough for a technical volunteer to wire into a form. For fully hands-off use, tools and agents can even self-register a key programmatically via the autonomous register endpoint.