By default, the suppression list will store anyone who meets the following criteria: they unsubscribe, someone marks your emails as spam, address manually added to the list or their email address contains a domain that is being suppressed. To ensure these individuals are never emailed again, the email addresses in your suppression list will not be added to any of your subscribers' lists.
Accessing your suppression list
Each account has their own suppression list, which you can access at any time from the Lists Tab, Suppression Manager. Here, you can manage your Suppression Lists
Once you access your suppression list, you can easily add and remove addresses you'd like to be included. Here's the main screen for a suppression list:
If you need to import someone who is on the suppression list (and you have their explicit permission to do so) you can easily remove them from the suppression list. Simply click 'remove emails' and enter the email address you wish to remove and click 'Import'.
Controlling which of your lists use the suppression list
By default, unsubscribe requests are not automatically added to the suppression list, however you can activate the 'Automate Suppression List' function, which will automatically remove all subscribers that unsubscribe from all of your lists.
Select which lists are scrubbed against the Suppression List
If you'd like to ensure a particular subscriber list does scrub any new subscribers against the suppression list or update it with any unsubscribes, head into the list details of any list remove the check next to the 'Global Suppression Rules' option.
You can change these settings at any time. If you decide to change your subscriber list so that it hooks into the suppression list, simply check the box.