说明：  C#编写的高级smtp客户端，控制台程序，可自行改写为Windows程序，功能齐全，除了基本的发件人地址，收件人地址（可以指定多个收件人，目前程序中设定为10个，可自行更改），主题，内容外，还能发附件（能发多个附件），能指定优先级别，能指定按HTML或TEXT发送，能指定发件人名称。一共有五个文件，MailAttachments.cs是负责处理附件的，MailMessage.cs是负责处理邮件消息的，SmtpMail.cs是负责联系SMTP服务器的，SmtpServerHelper.cs是主要的文件，负责与SMTP服务器交互并发送邮件，TestSmtpMail.cs是测试该SMTP客户端用的。可以用户将VS．NET 2003将各个文件添加到一个工程中后进行编译调试，也可分别把前四个文件编译成DLL（注意先后顺序和相互引用），然后把TestSmtpMail.cs编译成EXE后运行进行测试。
(C# prepared by the High smtp client, console procedures, may rewritten for Windows programs, a full range of functions, in addition to the address of the sender, the recipient address (you can specify a number of the addressee, the current procedures set for 10, can make changes), the theme, the content, but also the annex (Annex can be made more), will appoint a priority level, can designated by HTML or TEXT sent, the sender can be designated name. A total of five papers MailAttachments.cs are responsible for the annex, MailMessage.cs is responsible for handling e-mail messages. SmtpMail.cs is responsible for liaising SMTP server, SmtpServerHelper.cs is the main document, with interactive SMTP server and send mail, TestSmtpMail.cs is to test the SMTP client use. Users will be VS.NET 200)