Role-based emails are emails like: info@, support@, admin@, webmaster@, [email protected]
Role-based email addresses differ from other email addresses in that they are not associated with a person, but rather a company, position, or group.
If you import a csv file that has role-based emails you will notice that they fail to import
Note: If you believe that a role-based email is legitimate you can add it manually as a single subscriber to your list