接受指定邮箱的电子邮件，收取指定邮箱的邮件数量，使用jmail发送电子邮件，启动操作系统的邮件发送程序，tcp客户端与发送端-To accept the specified e-mail mailbox to collect the number of messages specified mailbox, use jmail send e-mail program for sending mail to start the operating system, tcp client and se