在ASP.NET中发邮件！

using System.Net.Mail;

MailMessage mm = new MailMessage(emailfrom.Text, emailto.Text);

        mm.Subject = subject.Text;
        mm.Body = body.Text;
        mm.IsBodyHtml = true;

        SmtpClient sc = new SmtpClient();
        sc.Send(mm);

上面是核心代码，在web.config里面须配置：

<system.net>
    <mailSettings>

      <smtp>
        <network host="smtp.qq.com" port="25" userName="******@qq.com" password="****" />
      </smtp> 

    </mailSettings>
  </system.net>

例子在网盘里面：http://xianexs.mail.qq.com/cgi-bin/downloadfilepart/svrid201/SendEmail.rar?svrid=201&fid=9019a5617ade29d516ad8277065e91edf77d9626607770bf&&txf_fid=b9a1aa515234e3d85ead8ae92e64c206b492bd92&&txf_sid=8bc796aa891fbfd07252862dacf3b0be7721b5ef