Reading other people's e-mail without their permission is an invasion of privacy. If you are caught, you could be suspended from school or your computer privileges could be taken away. It's not worth the risk!

Think about it:

Would you want anyone to read your personal e-mail? How about any other notes or letters that you write? What is privacy worth to you? What information about you (or your parents) do you think is private: your diary? medical information? grades? how much money you have? how much money you owe?