How it works

How email verification works.

The whole job, from messy list to clean list, takes minutes. Here's what happens after you click upload, in plain English.

01
Drop your list in
Drag in a CSV, paste a list of addresses, or hook up your email tool in one click. The original stays exactly where you put it; we work on a copy.
Worth knowing: You can also pipe addresses to us one at a time through our API, so dodgy emails get caught at signup.
02
We clean it
Each address goes through the checks that matter, and we stop early when we find a clear problem. You get a label, score, and plain-English reason for each result.
Worth knowing: The dashboard streams progress as the run works through the file, so you can see deliverable, risky, and undeliverable counts move in real time.
03
Send to real people
Download the clean list as a CSV and push it back into whatever you send from. Bad addresses get tagged so they stay out of your next campaign.
Worth knowing: Want to be cautious? Hold back the iffy ones for a smaller test send first. The reasons are right there to help you decide.

Curious what we actually check?

Here is what we look at for each email.

You don't see any of this in the app. We just do it. But if you're the kind of person who wants to know what's going on under the hood, here you go.

Check 01
Does it look right?
We catch broken formatting and suggest fixes for common domain typos.
Check 02
Is it a throwaway address?
We flag known temporary email services that are built to disappear.
Check 03
Is it a shared inbox?
We spot addresses like info@ and support@ so you can decide whether they belong in your campaign.
Check 04
Can the domain receive mail?
We check that the part after the @ has a working mail server.
Check 05
Any domain warning signs?
When available, we check live warning lists for domains linked to abuse or only recently seen.
Check 06
Will the server accept it?
We ask the receiving server about the address without sending an email.
Check 07
Does the server accept everything?
We try a made-up address to spot catch-all domains where every mailbox appears valid.
Check 08
What should you do?
We combine the results into a clear label, score, and plain-English reason.

What it can't fix

No email tool can do everything. We'd rather tell you upfront where the ceiling is than have you surprised later.

Some big providers intentionally avoid giving a clear answer about individual mailboxes. When the server's response is uncertain, we label the address risky or unknown instead of pretending we know more than we do.
Email addresses go stale. The one that worked today might be dead in six months. If you have a big list and you send rarely, run it through us again before each major campaign.
Cleaning your list won't fix everything. If you have bad SPF or DKIM setup, or if you're sending content that looks like spam, your emails will still struggle. We help with the address side; the rest is on you.
We give you a 'risky' bucket on purpose. When we're not sure, we say so. Other tools quietly hide their guesses. We'd rather be honest.

Send us 100 of your real addresses. We'll clean them, show you the results, and let you compare against your last campaign. No card needed.