在线程中发送我的电子邮件不起作用

Question

这个没有用，我真的不知道为什么它不发送电子邮件错了。我已经尝试了很多代码，但我仍然没有在帐户上收到任何消息。

Thread thread = new Thread(new Runnable(){
   @Override
   public void run() {
      try {   
         GMailSender sender = new GMailSender( email , "");
         sender.sendMail("Hi! This is your code:", test , "sender" , "recipients");   

         GMailSender sender1 = new GMailSender( email1 , "");
         sender1.sendMail("Hi!", 
                    "Employee No: " + (txt_Emp.getText().toString()) + "\nDevice Name: " 
                    + model + "\nDevice Serial No: " + (serial.toString()) + "\nDate: "
                    + (date.toString()) + "\nTime: " + (time.getText().toString()), 
                    "sender" , "recipients"); 

         Toast.makeText(MainActivity.this, "Email was sent successfully.",Toast.LENGTH_LONG).show(); 
         //Toast.makeText(MainActivity.this, test,Toast.LENGTH_LONG).show();
     }catch (Exception e) {   
         Log.e( "MainActivity" , "Email was not sent.", e);
         //Log.e("Email was not sent.", e.getMessage(), e); 
         //Toast.makeText(MainActivity.this, "Email was not sent.", Toast.LENGTH_LONG).show(); 

     }
   }
});

我真的不知道这里有什么不对，他们说应该在asynctask或专用线程上发送电子邮件。