mail_linux

代码说明：

  linux环境下实现发送邮件的SMTP服务器和负责接收邮件的POP3服务器，一个实现SMTP协议完成邮件的发送功能，一个实现POP3协议完成邮件的接收功能，两者分开。(Linux environment in the realization of the SMTP server to send mail and is responsible for receiving mail server of POP3, an implementation of the SMTP protocol to complete the mail sending function, an implementation of the POP3 protocol to complete the mail receiving function, the two separate. )