在给出的 pop程序中加上一个过滤器，使能够对接收邮件的主题内容进行关键字过滤。自定义一个关键字表，例如含有：SEX，FREE，SEPCIAL等内容。 通过pop3协议，从服务器上读取每份邮件的头部,然后从其中获邮件的主题(Subject),如果该主题含有你的关键字表中的内容，则认为其为垃圾邮件，将其主题打印在屏幕上。-In the given program with a pop filter, so that the subject be able to receive e-mail content keyword filtering. Customize a keyword table, for example, contains: SEX, FREE, SEPCIAL and so on. Through the pop3 protocol from the server to read every e-mail on the head, and then from which have been subject of the message (Subject), if the topic of your keywords in the table contains the contents of the view that it as junk mail, will be the theme of printed on the screen.