Role or role-based emails are the email addresses that do not belong to a specific person. Addresses such as info@, postmaster@, contact@ are examples of role emails. Some ESPs such as MailChimp do not allow the customers to send newsletters to role addresses. This is why you might need to know which email address is the role.
To learn more about role email, read this article.Is It Safe to Send Emails to Role-Based Email Addresses?