private void OnSend()
 {
     users = m_userNames.text.Split(new char[] { ';', ';', ';' });
     if (users == null || users.Length == 0 || string.IsNullOrEmpty(m_text.text))
     {
         return;
     }
     OnStateChanged("正在发送...");
     mail.AddReceivers("Runtime", users).AddFiles(fileTest).Send(m_text.text);
     OnStateChanged("发送成功");
 }