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Email System

E-mail, abbreviated from Electronic Mail, is a method of exchanging digital messages, between a sender and one or many recipients. E-mail is cheap, fast and safe. Today, we cannot think of running a successful business operation without having access to e-mail system.
An e-mail message consists of two components, the message header, and the message body or the content of the email. The message header contains control information, including the originator's email address and one or more recipient addresses. etc. There can be additional information, such as a subject in the header field, etc.
E-mail system allows exchange of e-mail messages using e-mail client and e-mail servers.
E-mail messages:
An e-mail message is a simple text message sent to a recipient. E-mail messages now have the ability to add attachments, which now makes many messages quite long.
E-mail Clients:
One would need some e-mail client in the computer to access e-mail messages. People use well-known, stand-alone clients like Microsoft Outlook, Outlook Express, Eudora or Pegasus while using a mail-system of an organisation and people who subscribe to free e-mail services like GMail or Hotmail or YahooMail, use an e-mail client that appears in a Web page.
Generally, the e-mail client does four things-

  1. Shows a list of all of the messages in the mailbox by displaying the message headers. The header of the message shows who has sent the mail, the subject of the mail and it may also show the time and date when the message was received and the message size.
  2. Allows one to select a message header and read the body of the e-mail message.
  3. Allows one to create new messages and send them.
  4. Allows one to add attachments to messages for sending and also allows saving of the attachments from messages received.

 Sophisticated e-mail clients may have additional features e.g. bells or audio signal to alert the user, etc.
Simple e-mail Server:
An e-mail server is the server for the e-mail client to connect to. One would need an e-mail server to send and receive e-mails.
There are millions computers on the Internet which are running server software applications and are acting as servers. For example: there are Web servers, FTP servers, e-mail servers, etc. These server machines run all the time and they listen to specific ports, waiting for people or programs to attach to the port.