邮件收发，有图形界面，能保存邮件至本地，不支持图片发送，附件发送-Mail, a graphical interface that can save the message to the local, does not support image transmission, attachment

本程序是用c#图形界面编写的一个用于发送邮件的小程序-This procedure is written in c# graphical interface used to send mail to a small program