Sign up in Spooftel.com and you send text without them know its you. You make calls change your voice and more.
That is really hard to do. Once you send a email, you are the sender and your address will show. That is how they catch perverts on the computer. The only way you can some one do that is go to the library and email them with the library computer, but you have to log in with some information so they still will know its you. Good luck on that.