If you cannot manually add a prospect to Snov.io, add an email address for single email verification, find emails with the provided domain via Emails from names tool, or find emails with a provided domain via Domain search tool, here is a possible reason.
There are some exceptions when emails or domains cannot be processed. Sometimes email addresses or domains can be deleted from the platform due to the owner’s request or other legal reasons. In this case, they may not be added to any list on the platform or processed in any way, and our users cannot send emails to them.