该程序是一个能够从pop3服务器中检查所有邮件，并且可以查看邮件内容，也可以删除邮件但是没有实现附件的接收，使用时需要设定服务器地址以及用户名和密码；-The program is a check from the pop3 server all the messages, and you can view the message content, you can delete the message but did not achieve to receive attachments, usi