说明：  在类里定义各种变量，如发送邮件服务器地址，接收邮件地址等；创建session,store对象，连接服务器；创建邮件，发送邮件。读取邮件信息，将邮件信息打印出来；关闭邮件。
(Variables defined in the class, such as sending e-mail server address, e-mail address to receive create session, store the object, connect to the server create a message, send the message. Read messages will print out messages off message.)