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     System.Net.Mail.SmtpClient client = new SmtpClient(SmtpServer);
  client.UseDefaultCredentials = false;
  client.Credentials = new System.Net.NetworkCredential(UID, PWD);
  client.DeliveryMethod = SmtpDeliveryMethod.Network;
  
  System.Net.Mail.MailMessage message = new MailMessage(From,TO, Subject,Body);
  message.BodyEncoding = System.Text.Encoding.UTF8;
  message.IsBodyHTML = true;
  client.Send(message);
  
    。