///
    /// NetMail方式测试通过
    ///
    private void TestSend()
    {
        System.Net.Mail.MailMessage mm = new System.Net.Mail.MailMessage();
        //收件人地址
        mm.To.Add(new System.Net.Mail.MailAddress("xxxxxx@163.com", "Name"));
        //发件人地址
        mm.From = new System.Net.Mail.MailAddress("xxxxx@sina.com");
        //这个可以不指定
        //mm.Sender = new System.Net.Mail.MailAddress("xxx@sina.com", "SenderName");、

        mm.Subject = "This is Test Email";
        mm.Body = "This is Testing SMTP Mail Send By Me";
        mm.IsBodyHtml = true;
        mm.Priority = System.Net.Mail.MailPriority.High; // 设置发送邮件的优先级
        System.Net.Mail.SmtpClient smtCliend = new System.Net.Mail.SmtpClient();
        //指定邮件服务器
        smtCliend.Host = "smtp.sina.com";
        //smtp邮件服务器的端口号 
        smtCliend.Port = 25;  
        //设置发件人邮箱的用户名和地址，使用公共邮件服务器一般需要提供，不然发送不会成功
        smtCliend.Credentials = new NetworkCredential("xxxxxxx", "xxxxxxx");

        //指定邮件的发送方式
        smtCliend.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
        try
        {
            smtCliend.Send(mm);
        }
        catch (System.Net.Mail.SmtpException ex)
        {
            Response.Write(ex.Message);
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
    }