When you're working with your subscriber lists, you might want to classify them based on things like characteristics such as age, gender, or location. You might also want to segment them based on activity, such as whether he or she is an active or passive subscriber

What is a passive subscriber?

A subscriber's email address becomes passive if one or more of the following occurs:

• One or more emails hard bounced;
• The subscriber filed a spam complaint;
• The subscriber has opted-out.

When one or more of these listed actions occur, Sendloop marks the email address as passive and adds it to your suppression list.