The e-mail goes into your electronic mailbox even if your computer is not turned on. After logging on to your Internet account, you can check to see if you have any mail. When you first open an e-mail message, the header contains a lot of information. You are able to tell who sent the message , what their Internet address is, the date and time that the message was sent, who the message was sent to and the subject of the message. The second part is the body of the message.
Some messages have a third part called the signature.
This non-essential part of the message is created ahead of time by the sender of the message. It usually includes the person's name, preferred e-mail address, mail address, and voice phone number. Some people get fancy and have a quote or a picture created with lines and dashes. It is important to copy the network addresses exactly. If even one character is wrong, your e-mail will be bounced right back to you unsent.