Internet 7 mail concept.pptVIP

Chapter 21 Electronic Mail Contents 21.1 Email 21.2 Email Functionality 21.3 The Operation Of Email 21.4 Email With A Web Browser 21.5 What Email Looks Like 21.6 Message Headers 21.7 Email Uses Client/Server 21.8 Email And Personal Computers 21.9 Email Address Format Contents (continued) 21.10 Making Addresses Easier 21.11 Sending Multiple Copies 21.12 Sending Email Outside The Internet 21.13 Using Email With Remote Services 21.14 Email Performance 21.15 The Significance Of Email Objectives Examine one of the most widely used services: electronic mail Summarize the basic functionality Show a typical use Describe how the underlying mechanism operates Summarize the significance 21.1 Email Researchers working on early computer networks realized that networks can provide a form of communication among individuals that combines: The speed of telephone communication The permanence of postal mail Small notes or large documents can be transferred across a network almost instantaneously. The new form of communication was called electronic mail, usually abbreviated email. 21.2 Email Functionality Electronic mail was originally designed to allow a pair of individuals to communicate via computer. Current electronic mail systems provide services that permit complex communication and interaction: Send a single message to many recipients Send a message that includes text, audio, video, or graphics Send a message to which a computer program responds Have a computer program to respond to each incoming message 21.3 The Operation Of Email To receive email a user needs: A storage area on disk that holds their incoming email messages until the user has time to read them (mailbox) A unique address associated with the mailbox (email address) Email software running on the computer where the mailbox resides that will automatically store incoming messages in the appropriate mailbox 21.3 The Operation Of Email (continued) To send el