I have been receiving communications from a man who is clearly unbalanced for approximately 13 years. He has contacted me on a fairly regular basis through regular mail (sent to my office, which is in the yellow pages) or email (he obtained my email address by convincing an acquaintance that he knew me), even though I have been ignoring him all this time.

He has never threatened me. He usually just sends me pornography, which goes right into the trash.

Is there anything I can do (besides ignore him). I have gone to the police a couple of times, but it is apparently not illegal to send pornography to an adult and you cannot obtain a restraining order unless there has been a threat.

Any advice would be appreciated.