To explain the architecture of electronic mail using four scenarios.
❑ To explain the user agent (UA), services provided by it, and two
types of user agents.
❑ To explain the mechanism of sending and receiving e-mails.
❑ To introduce the role of a message transfer agent and Simple Mail
Transfer Protocol (SMTP) as the formal protocol that handles MTA.
❑ To explain e-mail transfer phases.
❑ To discuss two message access agents (MAAs): POP and IMAP.
❑ To discuss MIME as a set of software functions that transforms non-
ASCII data to ASCII data and vice versa.
❑ To discuss the idea of Web-based e-mail.
❑ To explain the security of the e-mail system.