is replace the mailto: link in the postbit with an anonymous form that doesn't reveal the users' e-mail address to whoever is sending the mail.
It will also help protect against people will take the time to harvest your users' e-mail addy for spamming, like Chris from extremeforums did us on the UBB.
See it in action at:
@forums Beta Forum
Note: You hafta sign up for this to work properly and put your name in the From slot