Clean lists.
Confident sends.
Know which addresses are worth sending to — before you hit send. ListLumen cuts bounces, protects your reputation, and gets you in front of real people.
We never email your contacts — your list stays private.
Every email you send should count
Bad addresses cost you money, hurt your deliverability, and quietly wreck your sender reputation. ListLumen finds them first.
Reach real people
Send only to addresses that actually exist, so your message lands where it should.
Protect your reputation
Fewer bounces means mailbox providers trust you more — and more of your mail reaches the inbox.
Stop wasting spend
Don't pay to send to addresses that were never going to open. Trim the dead weight.
Catch costly typos
Obvious slips like gmial.com get flagged before they cost you a lead.
Built for bulk
One address or a list of millions — verify at the scale your campaigns actually run.
Simple in, simple out
Upload a plain list, download clean results. No lock-in, no fuss.
One clear verdict per address
No guesswork and no inflated numbers — just a status you can act on, plus a confidence score.
Deliverable
Real, reachable addresses. These are the ones worth your best campaigns.
Risky
Send with caution — uncertain or catch-all addresses that could bounce. Exclude them in one click.
Undeliverable
Dead ends. Remove them and watch your bounce rate drop instantly.
From raw list to clean send in three steps
Upload your list
Drop in a plain text file — one email per line — or send a batch straight from your app.
We check it
ListLumen reviews every address and grades it, quietly and privately, in the background.
Download what matters
Export just the deliverable addresses, drop the risky ones, or grab the full annotated report.
Verify right inside your product
A clean REST API secured with a key. Check a single address in real time, or run lists in bulk — the result is always a clear status you can act on.
- Real time single-address checks as users type or sign up
- Bulk submit a list, track progress, pull results
- Exports download exactly the segment you need
# Check one address curl -X POST https://app.listlumen.com/v1/verify \ -H "x-api-key: YOUR_KEY" \ -d '{"email":"maria@shopify.com"}' # → clear, actionable result { "status": "deliverable", "score": 96 }