What Laws are there against Cyber Bullying?

I have a really good friend who is being continuously harassed by a boy at her school. He used to call her and then hang up repeatedly and now he has taken it to e-mail. She doesn’t want to just block him because he could create another e-mail. I’m only 16 and I’m not sure if I can do much to help her. If you know of anyone that could help or if YOU could help, please respond. I appreciate it a lot. Thank you

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