基于SMTP或者C#类发送邮件原理及其实现

The Theory of Sending E_Mail Based on SMTP or C# Class and Realization

强大的．NET平台对编写邮件程序提供了有力的支持。该文总结了在c#环境下，基于底层的SMTP（ESMPT）协议和MIME协议发送电子邮件，以及使用MailMessage类创建并发送邮件的过程，并重点解析了身份认证，邮件编码以及发送邮件附件等关键实用技术，然后给出了实现代码。

The .NET platform provides power supports to developing Email systems. In this article, first described the process of sending Email based on SMTP （ESMTP） protocol and based on MailMessage class on C#; then expounded the key problems on user identifying, coding and appendix ,etc. ; lastly, given the codes on C#.NET.