自己写的具有图形界面的SMTP和POP3邮件服务器端程序,实现邮件发送和收取,新建用户功能,用最基本的语句描述了邮件服务器端与客户端之间的通信过程，对初学者十分有用!-Wrote it myself with a graphical interface, SMTP and POP3 mail server-side procedures, the realization of e-mail to send and receive, the new user features, using the