Clear Lists

You may clear the subscriber lists with the help of the navigation subitems 'Clear Invalid Addresses', 'Duplicate Matching', 'Blacklist Matching', and 'Opt-out Matching'.
This is, for example, necessary, if there are invalid addresses or multiple data records.

The 'Opt-out Matching' is important, as well, in order to make sure that the data records of subscribers that are opted out will be deleted in one or all subscriber lists.
The 'Blacklist Matching' is used for removing subscribers which are registered in the blacklist.

You will find more in information on the blacklist in 2.11 Blacklist.