Do you send an email to check an address?
No. We talk to the recipient's mail server and ask whether the mailbox exists, then hang up before any message would be sent. How it works.
What does "risky" mean?
The address probably exists, but sending carries some risk: it's a role inbox (info@, sales@), a disposable provider, or the domain accepts every address (catch-all), so a "yes" doesn't prove the mailbox is real.
Why would a result be "unknown"?
Some mail servers are slow, temporarily refuse new connections, or hide whether a mailbox exists. We retry, and if we still can't get an answer we refund the credit.
Should I send to catch-all addresses?
For newsletters to people who signed up, usually yes. For cold email, be careful: catch-all domains hide bounces until after you send, and cold campaigns are the least forgiving of bounces. Many senders put catch-alls in a separate, slower campaign.
Do credits expire?
Never. Pay-as-you-go credits stay in your account until you use them, and unused monthly credits roll over.
Are duplicates charged?
No. Duplicates are removed from every list before checking.
Is my list safe?
Your lists are only used to run your verification. We don't sell or share them, and you can delete a list and its results at any time. See our privacy policy.