A: Practically nothing! E-Mail is the cheapest way to send messages, compared to standard mail or fax. With E-Mail you can send a message containing dozens of pages across the world in minutes...at the cost of one phone call.
Q: Can people read my mail?
A: Your E-Mail may travel through a half dozen networks before reaching its destination. At each computer along the way, your message can be read.
A good rule of thumb is following: Don't write anything in an E-Mail message that you wouldn't post on a bulletin board.