Since about 48 hours ago, someone has been sending me spam from my own e-mail address. I know my e-mail hasn't been broken into. Once I determine their IP address, how can I block them from e-mailing me further? This is happening on my me.com e-mail address. Additionally, can I block an entire top-level domain from e-mailing me? Is there any authority (besides Apple) that I can contact to persecute the offending party?