| Invalid | The format of the email address is incorrect. E.g. ab@c@gmail.com |
| No-replies | Meaning that no emails should be sent to these addresses. E.g. noreply@domain.com |
| Bounces | Hard bounces are caused by email addresses that do not exist. |
| Bad MX / Domain | Email addresses with domains that are not configured properly. These emails will bounce. |
| Spam-traps | Email addresses with the sole purpose to collect spam. Never send to these addresses. |
| Catch-all | Domains that accept any email addresses that are either real or fake, but always return a clean value. This list may contain bounces and clean results. |
| Suspicious | Email addresses that have been rejected or deferred after multiple checks without a confirmed result. Emails marked Suspicious may bounce. |
| Unknown | The mailserver returned an unexpected result and we could not determine the status. Emails marked Unknown may bounce. |
| Timeout | The email provider was taking too long to respond to our queries. You can download and re-upload this list. All Timeout email credits are refunded. The server may have been too busy to respond to our request you can re-upload this list to be cleaned later. |
| Clean | This is an email address that exists and is ready to receive mail. |
