I can't guarantee that this will work for all of you, but it's certainly worked for me. Here's a way to ensure that a man will never, ever speak or write to me ever again.

When he asks for my phone number, I give it to him.

Once this happens, I will never hear from him, either via phone or email, ever again. It's amazing. This has happened to me four times in the past two months, with a 100% success rate.