To prevent attackers/spammers, I set up a number of rules for the Private message system.
1. Do not use the PM to plan attacks on the forum or other users.
2. Do not give or ask for any private information.
3. Right now, asking for adminship is allowed. But when the forum reaches over 80 members, it will be forbidden.
When a User sends an offensive or unwanted Private Messages
1. Contact an administrator and show them the message and they'll ban the sender.
2. Never reply back.
Any violations of these rules and you will be warned.