C#编写发送电子邮件

MailMessage MyEmilMessage=new MailMessage();
string attachFile; //用于构造附件的字符串变量

MyEmailMessage.From="Writer@sadf.com";
MyEmailMessage.To="Geter@dff.com;tome@asd.com";
MyEmailMessage.Subject="邮件发送的一个简单例子";
MyEmailMessage.body="猫王呼叫耗子,收到请回答!!!";
MyEmailMessage.BodyFormat=MailFormat.Text;
MyEmailMessage.Priority=MailPriority.High;

//构造添加附件
attachFile=@"D:\test\test.txt";
MailAttachment mailAttach=new MailAttachment(attachFile);
MyEmailMessage.Attachments.Add(mailAttach);

//发送电子邮件
SmtpMail.SmtpServer="发送电子邮件的SMTP地址或者IP";// 指定smtp服务器
SmtpMail.Send(MyEmailMessage);//发送电子邮件

http://www.cnblogs.com/1566/archive/2007/01/01/609431.html