Valid Email Verifier
Stop sending to people who are not there anymore
Old email lists go stale. Upload yours and we tell you which addresses still work, which ones are gone, and which are worth a second look, before you hit send.
Pay only for what you check. No subscription, no monthly minimum. An ASTGD product. See all products
1 credit = 1 email
Duplicates in a file are counted once.
No subscription
Buy credits when you need them. No monthly minimum.
Credits do not expire
Whatever you do not use stays on your account.
See the price first
Upload a list and we work out the cost before you pay.
Why it matters
A bad list costs you more than you think
Your emails start landing in spam
Mail providers watch how many of your messages bounce. Too many, and they quietly start filing the rest under spam — even for the people who do want to hear from you.
You pay for contacts who left
Most email tools charge by list size. Every address that no longer exists is money spent every single month on someone who will never open anything.
Your numbers stop making sense
Open and click rates are measured against everyone you sent to. Dead addresses drag those numbers down and hide how your campaigns are really doing.
What we check
Everything that makes an address a bad bet
Mailboxes that no longer exist
People leave jobs and abandon accounts. We ask the mail provider whether the mailbox is still there.
Broken addresses
Bad formatting, stray characters, and domains that cannot receive mail at all.
Throwaway addresses
Temporary inboxes people use once to get past a sign-up form and never open again.
Shared inboxes
Addresses like info@ or sales@ that reach a team rather than one person, flagged so you can decide.
Domains that accept everything
Some mail servers say yes to any address. We tell you, instead of calling it valid and hoping.
Duplicates
The same address twice in one file is checked and charged once.
See it happen
This is what checking looks like
A short example with six addresses. Your real results arrive the same way, just with your own list.
Checking
my-newsletter-list.csv
0
Valid
0
Invalid
0
Risky
-
valid
sarah.mitchell@example.com
-
risky
info@example.com
-
valid
j.wong@example.org
-
invalid
old.account@example.com
-
invalid
tempmail9@example.org
-
risky
p.novak@example.com
Illustration only. These are reserved example addresses, not real people.
Step by step
Four steps, and you are done
-
1
You upload your list
Drag in a spreadsheet or a text file — whatever your email tool exported is almost certainly fine. Nothing starts until you say go, and you can see the price before you commit.
- Spreadsheet or plain text
- Small lists and large ones
-
2
We tidy it up first
Before checking anything we clean the file itself: trim stray spaces, drop anything that is not really an email address, and remove duplicates. You are never charged twice for the same address in one upload.
- Duplicates removed
- Obvious typos filtered out
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3
We check every address
For each address we ask the mail provider whether that mailbox actually exists, the same question a mail server asks before delivering, and we stop before anything is sent. When a provider will not give a clear answer, we may send one short check email from our own domains to confirm. You can turn that off in your account settings.
- Your own domain is never used
- Deliberately paced, never rushed
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4
You download the clean file
You get a file back with every address labelled and the reason behind each result. Keep the good ones, drop the dead ones, and decide for yourself what to do with the in-between.
- Opens in any spreadsheet app
- Ready to import back into your email tool
Your results
Every address comes back labelled
No black box. Each address gets a plain-English label and the reason behind it, so you decide what to keep.
The mailbox looks real and is accepting mail. These are the ones to send to.
Nobody is there. Remove these — they are what damages your reputation.
Either it accepts everything and we cannot promise a person reads it, or the provider would not give us a straight answer. Send with care.
Results are our best reading of the signals available at the time. No check can promise that a message will be delivered, or that someone has agreed to hear from you.
In your account
Built for lists you keep using
Free Check
Paste up to 25 addresses and get answers fast. Every account starts with 100 free checks.
Tasks for bigger jobs
Group several lists into one task and follow their progress in one place. You can close the tab while they run.
Your columns stay
Names, companies and anything else in your file stay with each address, so the result goes straight back into your tool.
Clean list or full report
Download only the addresses worth sending to, or every address with its label and the reason behind it.
A home for your contacts
Keep lists in the List Manager, split them into segments, and check them again when they start to age.
A suppression list
Keep the addresses you should never contact in one place.
The part people worry about
Your list stays yours
Handing over a contact list is a big ask. Here is exactly what we do and do not do with it.
We do not sell your list.
We do not use your list to send marketing, ours or anyone else's.
Most addresses are checked without sending anything. We ask the mail provider and stop there.
When a provider will not give a clear answer, we may send one short check email from our own domains. You can turn this off in your account settings.
Uploads and results are removed automatically on a schedule. Some records stay longer, as the Privacy Policy explains.
Only you can download your results, from your own account.
Get started
Estimate your cost, or buy credits directly.
Upload a list to price it before you commit, or top up your balance first. Either way you land at the same checkout.
1 credit = 1 email
Please try it first: every account gets 100 free checks. Credit purchases are final and non-refundable once the credits are in your account. Refund Policy
Credit Packs
Choose a pack or buy a custom credit amount.
The same ladder you see in your account. The more credits you buy at once, the less each one costs.
Select a pack or enter a custom amount
Volume
The bigger the list, the less each check costs
| List size | Price per email |
|---|---|
| 1 - 4,999 emails | $0.015 |
| 5,000 - 24,999 emails | $0.012 |
| 25,000 - 99,999 emails | $0.009 |
| 100,000 - 499,999 emails | $0.006 |
| 500,000 - 1,999,999 emails | $0.0035 |
| 2,000,000+ emails | $0.002 |
FAQ
Questions people ask us
Will this get me marked as a spammer?
No. Checks run from our own servers and domains, so your domain and your sending reputation are not involved. Most addresses are checked without sending anything. Where a provider will not give a clear answer we may send one short check email from our own domains, and you can turn that off in your account settings.
What kind of file can I upload?
A spreadsheet or a plain text file — one address per line or in a column. If you export from your email tool, whatever it gives you will almost certainly work.
How accurate is it?
For most addresses we get a clear yes or no. Some providers deliberately accept everything or refuse to answer, and there we say risky instead of guessing. No checker can guarantee delivery, but an honest label is more useful than a confident wrong one.
How long does it take?
Small lists come back in minutes. Large ones take longer because we deliberately go at a polite pace with each mail provider — rushing gets everyone blocked. You can close the tab and come back later; your account shows how far along a list is while it runs.
What if the same address appears twice?
We remove duplicates before we start, so you are never charged twice for the same address in one upload.
Do my credits expire?
No. Credits stay in your account until you use them. There is no monthly reset and no subscription running in the background.
Can I try it before buying?
Yes, and please do, because credit purchases are final. Every account gets 100 free checks in Free Check, up to 25 addresses at a time. After those, Free Check uses one credit per address.
What if a list fails partway through?
You are only charged for addresses that were actually checked. Anything that did not run stays in your balance.
How do I pay?
Pick a pack or enter the amount you need, and pay at checkout on this site through our payment provider. The credits are added to your account as soon as the payment is confirmed.
Can I get a refund on credits?
No. Credit purchases are final and non-refundable once the credits are in your account, whether you have used them or not, so please test the service before you buy. The Refund Policy has the details, including the rights the law gives you regardless.
Does a valid result mean I can email that person?
No. A check tells you about the address, not about permission. You still need consent or another lawful basis to contact someone, and the lists you upload must be ones you are allowed to use. The Acceptable Use Policy has the rules.
I use the desktop version. What changes?
Nothing you already have. Your desktop licence keeps working exactly as it does today. The cloud service is the version we sell and develop from now on; it needs no installation, runs any size of list, and is paid for per address instead of per licence.
Clean your list before the next send
Create an account, use your 100 free checks, and see what is actually in your list.