Accuracy & Transparency
Every email validator claims 98%+ accuracy. None of them define what that means or show you the data. Here’s our methodology, our guarantee, and our commitment to publishing real numbers.
Our methodology
Four rules. No asterisks.
We track the bounce rate of emails we score 90+ ("valid" verdict). If you send to an address we marked valid and it hard-bounces (5xx permanent failure), that counts against our accuracy.
Email addresses decay — people leave companies, mailboxes get deleted. We measure bounces within 30 days of validation, which is the industry-standard freshness window.
If more than 3% of emails we mark valid bounce within 30 days, we credit your account. No questions, no forms, no sales call. Credits issued within 48 hours of a valid claim.
Soft bounces (temporary failures), emails scored below 90, and addresses sent after the 30-day window. We also exclude emails where verification_level was "estimated" (SMTP was inconclusive) — we already told you we weren't sure.
Applies to all paid plans. Emails must be sent within 30 days of validation. Credits are issued within 48 hours of a valid claim — no questions, no forms, no sales call.
Why this matters
ZeroBounce, NeverBounce, MillionVerifier — none of them publish their actual bounce rates. They all claim 98-99% accuracy but provide no methodology. You can't verify a claim nobody defines.
Teams chain 2-3 validators because they don't trust any single one. That's not a tools problem — it's a trust problem. And trust requires transparency.
We will publish monthly accuracy reports once we have statistically meaningful volume. Until then, the methodology is here, the guarantee is live, and you can hold us to both.
Extended verification
Use extended depth for high-value leads, cold outreach lists, and anywhere a false negative costs more than an extra 3 seconds.