Real mailbox checks
CleanContact connects to the mail server in real time and checks whether it accepts emails sent to that address.
Check the email addresses
before sending the newsletter
CleanContact checks the email address directly through the mail server to determine whether it accepts emails.
Clean up your mailing list before sending, reduce the number of undelivered emails, and protect your sender reputation.
Live demo
Validate an email right now
Type any address below. This form runs a real check through the CleanContact network and returns the same result our API does.
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The verification will take a few seconds
Validation that actually knocks on the door
Many services only check the email address format and the MX record. CleanContact contacts the mail server to verify whether it accepts emails.
Checking catch-all addresses
Some mail servers accept emails even when sent to non-existent addresses. That's why we use an additional verification step for popular domains such as mail.ru, yandex.ru, and gmail.com.
Humaneness ML score
Our model looks at the part of the address before the @ and rates from 0 to 1 how much it looks like one a person came up with. Auto-generated addresses get a low score even when they pass every other check.
Simple integration
One GET request—a verification result with an explanation. No complicated setup required.
Whole-file checks
Upload a CSV or TXT with your list in your account and start the check. When it's done, download the results as one file.
Protecting the Sender's Reputation
Check your base before sending out emails to reduce the number of undelivered messages and lower the risk of ending up in spam traps or blocklists.
How a validation flows
From one request to a confident answer in four steps.
Send the address
Send an email to /validate using a GET or POST request and include your API key.
Verifying the address
First, we check the format and blacklists. If the address has already been checked, we immediately return the saved result.
Checking the mail server
We check that the domain actually has a mail server, that the specific mailbox exists, and that the address is not a disposable one — matching it against our DEA blacklist.
Assessing the risk
An ML model scores how much the address looks like one a person came up with. We also flag suspicious addresses and the Gmail and Yandex dot trick, when one address signs up again under a different spelling with dots or hyphens.
Three Clear Statuses
Every check resolves to exactly one of these.
The address is valid and accepts mail. You can keep it in the database.
The address does not exist, or the server rejected it. It is best to remove this address from the database.
The server would not give a definitive answer in time. Retry later or treat with caution.
Ready to check the address database?
Pay only for individual checks, or choose a subscription with a daily limit.