We ask the recipient's mail server whether the mailbox exists, check the domain, spot catch-all, disposable and role addresses, and tell you exactly what we found. No email is sent.
10 free checks a day per visitor. Need more? Create a free account for 100 credits, bulk upload and the API.
A label (Deliverable, Invalid, Catch-all, Disposable, Role, Unknown), the reason in plain English, and the mail server that answered.
Send anything to the address, store your check against your name, or sell the address on. The check is a handshake, not a message.
Sign up free, paste up to 100 addresses at a time in the dashboard, or upload a CSV. 100 credits included.
Reading the result
| Label | What happened | What to do |
|---|---|---|
| Deliverable | The mail server confirmed the mailbox exists. | Send. |
| Invalid | The server said the mailbox doesn't exist, or the domain has no mail server. | Remove. It will bounce. |
| Catch-all | The domain accepts every address, so nobody outside can confirm this one. | Your call. Lower cadence, drop on first bounce. |
| Disposable | Temporary inbox provider. | Don't build a list on it. |
| Role | Shared inbox (info@, sales@ ...). Deliverable, but impersonal. | Keep for newsletters, skip for personal outreach. |
| Unknown | The server refused to answer in time, even after retries. | Retry later, or treat as risky. |