I don't get bothered by internet trolls and stalkers because the law protects us to a certain extent. I think a fair warning is sufficient. If it persists, it's easy to get the service provider to cooperate with law enforcement. I once had a coworker in the public sector who is retired now, that sent harassing emails to me. They were of how to beat women pamphlets, racist anti hiring editorials, and diatribes against all blacks. And this now retired public servant is now collecting a pension. This sort of thing happens everyday, and the better way to deal with it is to collect the evidence, note the time and day, contact an EEO laywer and file a formal complaint.