用户 收发电子邮件，该功能很简单，很方便被学习-Users to send and receive e-mail users, this feature is very simple and very easy to be learning

用c#实现能过socket连接smtp实现发送邮件及附件的小程序，通常可用来定时通知什么的csharp.mail.socket-Achieved with c# socket connection to have smtp send mail and attachments to achieve a small program, usually used to regularly informed of what csharp.mail.socket