Can someone please explain (or point me at a document) the logic behind bounces - after how many bounces does the user get added to the suppression list?
Is there a difference between 'deleted' and the suppression list? and can users only be added to 'deleted' by the admin deliberatly putting them there?
Hard bounces are removed automatically and soft bounces need to bounce 3 times with no trackable activity between before they'll be removed.
Deleted is indeed a deliberate action. It's limited to the list itself, so if you delete an address from a list it won't suppress them from being added to future lists. Adding someone to the suppression list prevents them from being imported to future lists.