一个web页面下的发信组件，只能发送文本和html格式的邮件，支持二次开发。-a web page letter under the components, can only send text and html format of the mail, the development of secondary support.

一个用C#编写的邮件收发系统，可以实现邮件的收发功能-One written in C# the mail system, can send and receive mail function