SmtpMail.SmtpServer = dt.Rows[0]["EmailSmtp"].ToString();
      
        //发送邮件 
        try
        {
            MailMessage aMessage = new MailMessage();
            aMessage.From = EmailUsername;
            aMessage.To = ToEmail;
            aMessage.Subject = SubjectStr;
            aMessage.Body = MailContent;
            aMessage.BodyFormat = MailFormat.Html;

            aMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");//基本认证

            aMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", EmailUsername);//邮箱帐号

            aMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", EmailPassword);//邮箱密码

            SmtpMail.Send(aMessage);
           
        }
        catch (Exception ex)
        {
            //MessageBox.Show(ex.ToString()); 
        }