A small team, a stubborn standard.
We’re a remote-first crew of engineers and deliverability nerds who care more about being right than looking right. Most verifiers compete on a bigger accuracy number; we compete on the truth — and we built the whole company around protecting it.
Four disciplines, one honest instrument.
We stay small on purpose. Every part of EmailListChecker is owned by people who can explain exactly why a verdict says what it says.
We hire people who’d rather be correct than impressive.
No sprawling org chart, no layers between you and the engineer who wrote the SMTP probe. When you ask “why is this address risky?”, the answer comes from someone who could rewrite that check by hand.
Verification engineering
The SMTP, MX and catch-all logic — the part that decides whether a verdict is real or a guess.
AI & assistant
The agentic layer and MCP server that turn raw verdicts into plain-English, graded answers.
Developer experience
REST API, SDKs, webhooks and native integrations for Mailchimp, HubSpot, Klaviyo and SendGrid.
Trust & security
Compliance, encryption, and the questionnaires — so enterprise senders can say yes without a second thought.
Four values, non-negotiable.
These aren’t posters on a wall — they’re the rules the product is built to obey.
Show our work
Accuracy claims are cheap. We expose the syntax, MX and SMTP confidence behind every verdict — and when a mailbox genuinely can’t be determined, we say so instead of faking a green light.
Be fair by default
Credits never expire and you pay only for answers we’re sure of. No 12-month clock quietly deleting what you bought, no charging you for an undeterminable result.
Make it human
Deliverability is full of cryptic labels. We translate them into plain English — and built an AI you can ask “is this list safe to send?” to get a graded, honest answer.
Earn the trust
GDPR compliance by design. Your lists travel over TLS, are never sold and never shared. The data you hand us is the data we protect.
From a broken category to a rebuilt one.
- The problem
Verifiers that hide the truth
Every tool in the category promised “99% accurate,” handed back a wall of statuses to decode, then quietly expired the credits you’d already paid for.
- The rebuild
Honest from the engine up
We rebuilt the verification engine to report true per-check confidence, and priced it so you only pay for answers we can stand behind.
- Today
10B+ emails · 80,000+ teams
A complete deliverability platform — bulk, real-time API, inbox placement, finder, integrations — fronted by an AI that explains every result.
deliverability health
- 95% fewer bounces — or money back
- 0.3s median API response
- ∞ credits never expire
The promises we won’t break.
Every product decision passes through these four filters. If a feature would make us look more accurate by hiding the truth, it doesn’t ship.
- 01
Default to transparency, even when it costs us a sale.
- 02
Never ship a fake green light to look more accurate.
- 03
Price for value delivered, not for a calendar running out.
- 04
Explain the “why,” not just the verdict.
Build the honest one.
We’re a small, remote-first team of engineers and deliverability nerds who care more about being right than looking right. If transparency over hype sounds like you, we’d love to talk.
[email protected]Questions before you switch?
Migrating from ZeroBounce, NeverBounce or Bouncer? We’ll tell you honestly where we win and where we don’t — and help you move credits that finally won’t expire.
Talk to the teamSee your list graded — free.
100 verifications, no credit card, credits that never expire. Honesty you can test in under a minute.