// The list validator that won't fire you

CLEAN LIST.
MORE MONEY.
LET'S GO.

Dead emails cost you every single send. We wipe them out fast and hand back a list that actually prints. No lectures, no judgement.

Clean my list → or run the API
First 1,000 addresses free. No card.
// The analysis, not the blah

We don't ping. We investigate.

A basic check asks one question: did the mailbox answer? We ask a lot more, then hand you the verdict, not the raw data dump.

// The domain

Is it real and alive?

The domain, its mail records, its age and history. A dead or thrown-together domain is money you never had.

// The infrastructure

Can it even receive?

Whether the address can actually take mail, and whether it is a catch-all hiding dead boxes behind a "yes to everything" door.

// The risk

Will it bite you?

Traps, complainers, and the quiet risky ones that pass a basic check and then wreck your reputation. Those get a HOLD or a DROP, with the reason.

Every layer, one plain verdict.

// Who it's for

If you send email,
this is for you.

Almost every business that sends to a list needs this. We just say yes to the corners everyone else is too soft to serve.

The list burners

They chew through lists fastest, so they buy cleaning by the bucket.

Cold-outreach agenciesLead-gen shopsEmail marketersGrowth teamsESP resellersData / list sellersAppointment setters

The mainstream ones

Big lists, real budgets, exact same problem.

EcommerceSaaSAgenciesAffiliatesNewslettersEventsFintechB2B+ every mainstream vertical

The ones others won't keep

The harder industries the big validators get squeamish about. If the list is real and it's yours to mail, we say yes. Served discreetly.

High-risk verticalsRegulated niches+ quietly, on request

40+ industries. One answer: yes.

// How it works

Three steps.

// Step 01

Drop your list

Upload a CSV or push it through the API. Any size, any source, any industry. We don't flinch.

// Step 02

Every address gets a verdict

SEND, HOLD or DROP with a plain-words reason. We read the domain, the infrastructure and the behaviour, not just whether the mailbox pings back.

// Step 03

Mail the clean list, cash in

SEND the good ones, sit on the HOLDs, DROP the dead. Fewer bounces, fewer complaints, more money every send.

See how it works in full →
// Them vs us

Same list. Very
different treatment.

The big tools

Squeamish.

  • Drop you the second they see your industry
  • Hand you a mystery score and good luck
  • Miss the risky ones hiding as "deliverable"
  • No help, no reasons, no straight answers
ListBro

On your side.

  • Built for the senders they won't keep
  • SEND / HOLD / DROP with a reason on every one
  • Catch the quiet risk before it wrecks your rep
  • White-label it and sell it as your own
bounce rate on a real list, before and after a clean · illustrative
// The offer

See the money before
you spend a cent.

  • Your first 1,000 addresses cleaned, free
  • A straight SEND / HOLD / DROP on every one, with the reason
  • The dead weight gone, so your next send actually pays
  • No card, no lock-in, no judgement
Clean my list →
First 1,000 free. No card. Let's go.
Per list
pay as you go
  • Upload a CSV
  • SEND / HOLD / DROP verdicts
  • Plain-words reasons
  • Credits never expire
See packages
The API
real-time, recurring
  • One call per address
  • Verify every signup live
  • Workflow integrations
  • Priority throughput
Get an API key
White-label
your brand on it
  • Your name on the verdicts
  • Reseller pricing
  • Your customers, your product
  • We help you say it right
Talk white-label
first 1,000 free on every plan · backed by the Straight-Up Guarantee
// For builders & resellers

One endpoint.
Your name on it.

Wire cleaning into your own product or workflow, or white-label the whole thing and sell it as yours. One API call per address, or a step in n8n, Make or Zapier. Same verdicts, your brand.

Get an API key Talk white-label
ListBro mascot
// Questions

The honest FAQ.

Will you clean a high-risk or regulated list?

Yes. That's the point. If your list is real and it's yours to mail, we'll clean it. We don't moralise about your industry.

What do SEND, HOLD and DROP mean?

SEND is safe to mail today. HOLD looks fine but behaves oddly, so wait or send carefully. DROP will hurt you, so bin it. Every verdict comes with a plain reason.

Do you guarantee I'll hit the inbox?

No, and be careful with anyone who does. We remove what's dragging you down. The inbox you earn with good sending from there.

Can I put my own brand on it?

Yes. White-label the verdicts, or resell as an affiliate, and sell cleaning as your own product. We help you describe the deliverability side correctly.

How do I connect it to my stack?

One API call per address, or a step in n8n, Make or Zapier. Structured verdicts back, ready to act on.

Read the full FAQ →