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You can delete auto-target groups and static target groups under Addresses → Lists → Target groups. Place a checkmark next to the target groups that you want to delete.
Now click on Delete.
Target groups marked as deleted are removed from the selection lists.
After six months they will be automatically and permanently deleted following a detailed technical check.
The date when the deletion takes place can be displayed in the details of the target group.
Until then, you can have the deleted target groups listed under Show 'deleted' only and, if necessary, restore them if they were accidentally deleted.