It sometimes happens that way - you may have collected yourself a 'secret admirer'. Usually they are benign but sometimes they are not. What I found the best for me is to disable email through the board (UserCp - Edit Options). PM's are still active and if there is a necessity to exchange an email address, it can be done through a pm.
Whirleybird, the writer cannot see your email address through the board. The fact that you responded, exposed your email address.
The old internet safeguard is valuable here .. if you don't want to interact with someone, just dont. Don't tell them that you don't want to
