This will be done in the "three strikes you're out" approach.
Strike 1: Warning via PM.
Strike 2: Temporary ban. 1-2 weeks, depending on what you did.
Strike 3: Banned forever.
Also, if a member is banned that means they are not allowed to come back and I have access to everyone's IP addresses so if a banned member returns, I WILL find out.
If any members have contact with a previously banned member that registered under a new account they too run the risk of having their own account deleted. I can access any members account if need be and deleted PM's can and will be retrieved if neccesary.