The suppression list is a special type of subscriber list in Campaign Monitor. It contains email addresses you don't want to send to, to help protect your sending reputation. A subscriber's email address is automatically added to the suppression list if:
- The address hard bounces.
- The subscriber marks one of your emails as spam (unless they are on Gmail).
- The subscriber unsubscribes, or you set their status to unsubscribed.
- It was part of a bulk remove operation, with the "Unsubscribe from all lists" option selected.
For further information on this, click here—or if you need further assistance in regards to Campaign Monitor, please contact their support team here.
If you ever have any questions, please send them to us via the Submit a Request option in your Help & Support page—we're here to help.