Concept of Email
Email refers to Electronic mail, is a method of exchanging digital messages from an originators to one or more recipients. Modern email operates across the Internet or other computer networks. Today’s email systems are based on a store-and-forward model. Email servers accept, forward, deliver and store messages. Neither the users nor their computers are required to be online simultaneously, they need connect only briefly, typically to an email server, for as long as it takes to send or receive messages. An Internet email message consists of three components, the message envelope, the message header and the message body.
A popular protocol for sending email is Simple Mail Transfer Protocol (SMTP) and a popular protocol for receiving it is POP3. Both Netscape and Microsoft include an email utility with their Web browsers.