Valid - means this email address exists and can receive emails, meaning you can use it safely.

Not valid - this email is disabled or does not exist. Avoid using this email address.

Catch-all - means this email is linked to a catch-all domain. It can receive emails, but it is not possible to determine if there is a real recipient behind it. We do not recommend using these addresses.

Unknown - means we were not able to verify this email at this time. Most frequent reason is that it was not possible to connect to this email server. You can try to verify these emails later. We do not charge credits for the emails with unknown status.