We ask the mail server itself
For every address we contact the company that runs the mailbox and ask whether it is real. That is a live answer about that exact address, not a guess based on how it looks.
Find the dead addresses on your list before you send
Bouncing emails damage your reputation and stop your messages reaching real customers. We check each address and tell you plainly which ones to drop.
Most list-cleaning tools quietly delete customers who were never gone
Ask about an address and you can get either of these back. They arrive looking almost the same.
“That mailbox does not exist.”
A real answer about a real address. The person has gone, or it was mistyped when you collected it.
Safe to delete
“I am not going to tell you.”
Plenty of companies refuse to confirm anything about their staff addresses, as a security measure. That is a statement about their policy, not about your customer.
Proves nothing either way
Most tools treat the second one as though it were the first, and hand back a tidy list with your real customers quietly removed.
You never find out, because a list that lost a thousand good customers looks exactly like a list that was cleaned properly.
We only remove an address when we were actually told it is dead. Everything else comes back marked uncertain, and the decision stays yours.
Five answers, not just good or bad
A simple yes or no cannot describe an address nobody is able to check. So we do not pretend it can.
- Valid
- The mailbox is real and can receive email. Safe to send to.
- Invalid
- This address cannot receive email. Take it off your list.
- Catch-all
- This company accepts email sent to any address at all, so nobody can tell whether this particular person exists.
- Risky
- It works, but it is a throwaway address or a shared inbox like info@ rather than a person.
- Unknown
- The other side would not answer us. We say so plainly instead of guessing.
Upload a list, get it back sorted
No setup, no installing anything. A spreadsheet goes in and a clean one comes out.
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Upload your spreadsheet
Any size. We show you how many addresses it holds, how many are duplicates, and exactly what it will cost before anything is charged.
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Leave it running
Watch the progress if you like, or close the tab and get on with something else. We email you the moment it is finished.
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See what you have
Safe to send, remove, cannot be confirmed, shared inboxes, and the ones nobody could check. Every address gets a plain sentence explaining why.
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Download it back
Take the clean list, the removals on their own, or everything with your original columns untouched so it slots straight back into your system.
You decide how cautious to be
A single control sets whether uncertain addresses count as safe to send. Every other service makes that decision for you, quietly.
Credits never expire
Buy what you need when you need it. Nothing is lost because you did not send a campaign this month.
Your file is yours
Choose how long we keep it, delete it whenever you want, and we never sell, share, or reuse anything you upload.
What you get with an account
Everything here works today. Sign up and the first hundred verifications are free.
Spreadsheets, both kinds
CSV or Excel, up to 50 MB. Columns are found for you, duplicates are collapsed, and rows that were never addresses are set aside rather than charged for.
Four files back, not one
The full results, a clean list ready to send, your original file with the bad rows stripped out, and the removed rows on their own so you can see what went. CSV or Excel.
One address at a time
Paste a single address and get an answer immediately, with a history of what we said about it before.
An API for your own systems
Verify one address or submit a whole list from your own code. Keys you create and revoke yourself, and the same pricing as the interface.
Check your sending domain
SPF, DKIM, DMARC and MX, read from public DNS with what to fix. A clean list still lands in spam if your domain says nothing about itself. Free, and it uses no credits.
You set how long we keep it
Choose a retention window, or delete a list and its results the moment you have downloaded them. Export everything we hold about you whenever you like.
What we look at
Nothing is ever sent
We stop before writing a message. Nobody on your list receives anything, and no one is told a check happened.
Typos get caught
Someone typing gmial.com instead of gmail.com is a lost customer, not a bad address. We show you the correction.
Throwaway addresses
Temporary inboxes people use to grab a discount and abandon get flagged, not passed as clean.
Shared inboxes
Addresses like info@ or sales@ reach a team, not a person. They usually work, so most tools pass them silently. We tell you they are shared so you can decide.
Where we can give you a straight answer
A few email providers accept mail addressed to anyone, so nobody can confirm a single mailbox there. Those rows are on the list too.
| Email provider | Can we tell? |
|---|---|
| Gmail | Yes |
| Outlook, Hotmail, Live | Yes |
| Apple iCloud | Yes |
| Proton, Fastmail, Zoho | Yes |
| Company addresses on their own domain | Yes |
| Microsoft work accounts | Usually |
| GMX, web.de | Usually |
| Yahoo, AOL, Mail.ru | Nobody can |
| Domains that accept any address | Nobody can |
Try it on an address you already know about
Check your own address, and one you know is dead. The first hundred checks are free and you do not need a card.