通过IMAP协议列印邮件列表-through IMAP protocol print mailing list

一个邮箱的pop3操作的小程序，功能很简单只能得到邮件的列表-Operation of a pop3 mailbox small program features a simple list can only get the message

pop客户端的简单实现，通过user、pass命令实现用户登录，list、retr实现邮件列表和显示邮件内容-simply pop the client to achieve, by user, pass the command to achieve the user log, list, retr to achieve the mailing list and display the message content