Once the message is done, you obviously need some kind of command for sending the message to its destination. Somewhere on the document, you will be given a place to put the email address of the recipient. Be very careful when typing in this address! If you make a mistake or misspell the email address, your mail will not go through. The post office can guess when your address is a little sloppy, but the DNS system cannot! Check carefully before sending your message. Once it is sent, you cannot get it back! Be especially aware of this if you are sending an angry message you may regret later. Once you activate the send command, your letter will be broken into TCP/IP packets and sent to the recipient, where she will use her email program to read it.