1. Email and its Protocols Hina Patel TCM-471 04-20-03

2. Email and its Protocols Introduction of E-mail History of E-mail E-mail protocols (SMTP, POP3, IMAP) Comparison of IMAP and POP3 Advantages and Disadvantages Conclusion

3. Introduction of E-mail Most popular application/feature of Internet King of Internet Dating to business,even to war

4. Introduction (continue) % of North American use following modes of communication and the average amount of use per day. - Land-line phone 92% 45 minutes - Email 53% 29 minutes - Mobile phone 43% 16 minutes - IM 17% 16 minutes - Online Chat 9% 24 minutes - Mobile messaging 4% 14 minutes

5. E-mail History 1968 Bolt Beranek firm hire by United states Defense Department ARPANET 1971 Ray Tomlinson assigned for SNDMSG @

6. E-mail's Protocols SMTP ( Mail posting) Simple Mail Transfer Protocol POP3 (Mail reading) Post Office Protocol IMAP ( Mail reading/managing) Internet Message Access Protocol

7. SMTP Based on TCP port 25 ( run by mail server) Mailing Sending Sender SMTP Receiver SMTP

8. POP3 Standard client/server protocol Delivering message TCP port 110

9. POP3 (Continue) Authentication Updates Transaction

10. IMAP Originally from Stanford University 1968 Manipulate from desktop, home computer, office workstation, notebook computer. Provide support for “online,offline, and disconnected.”

11. IMAP Vs. POP3 IMAP access from any computer/any where. Store mail on server Folder can be server and clients. Send message back and forth POP3 Used by one client/computer Store mail on client computer organizing mail into client-side folder. Send messages one way.

12. SMTP (advantages and disadvantages) Advantages - no password Disadvantages - None.

13. POP3 (Advantages and Disadvantages) Advantages - simple protocol - Easier to implement - Copies all messages when connection is made. - When not connected, still access and read downloaded mail. Disadvantages - if mail in different format, hassle to transfer mail. -synchronize their local inbox/server.

14. IMAP (Advantages and Disadvantages) Advantages - can store message - Can access/manage multiple mail boxes. - New/old mail can be accessed from any pc. - Client independent. - (switch mail to client PC without affecting user mail Disadvantages - fewer client than POP3 - slower than POP3 - less IMAP Software than POP3 - require more effect

15. Conclusion POP3- one client/computer client side SMTP- one server to another can be retrieved with POP3 and IMAP IMAP- any computer client/server side more complex