Outlines requirements and time allocation 2.42 Comparison with HTTP 20分钟 http:pull email:push both have ASCII command/response interaction,status codes http:each object is encapsulated in its own response message smtp:multiple objects message sent in a multipart message 2.4.3 Mail Message Fomats and MIME 25分钟 RFC822:standard for text message format header lines,e.g, To: from Subject: different fromsmtp commands body the "message",ASCII characters only MIME:multimedia mail extension,RFC2045 25分钟 2.4.4 Mail Access Protocol POP:Post Office Protocol [RFC 1939] authorization(agent <->server)and download IMAP:Internet Mail Access Protocol [RFC 1730] more features(more complex),manipulation of stored msgs on server HTTP:Hotmail,Yahoo!Mail,etc POP3 protocol 10分钟 2.4.5 Continus Media E-mail (重点讲解Mail Message Formats和POP3 protocol,用启发、讨论式教学方式教 学。) 5分钟 复习本次课的主要内容。 11 11 Outlines, requirements and time allocation 2.4.2 Comparison with HTTP http: pull email: push both have ASCII command/response interaction, status codes http: each object is encapsulated in its own response message smtp: multiple objects message sent in a multipart message 2.4.3 Mail Message Formats and MIME RFC 822: standard for text message format: header lines, e.g., To: From: Subject: different from smtp commands! body the “message”, ASCII characters only MIME: multimedia mail extension, RFC 2045 2.4.4 Mail Access Protocol POP: Post Office Protocol [RFC 1939] authorization (agent <->server) and download IMAP: Internet Mail Access Protocol [RFC 1730] more features (more complex), manipulation of stored msgs on server HTTP: Hotmail , Yahoo! Mail, etc. POP3 protocol 2.4.5 Continus Media E-mail （重点讲解 Mail Message Formats 和 POP3 protocol，用启发、讨论式教学方式教 学。） 复习本次课的主要内容。 20 分钟 25 分钟 25 分钟 10 分钟 5 分钟