Laravel Mail::send returns zero with no specific error in Mail::failures()

I am using smtp driver and this is my code to send email in laravel 5.2:

public function Sendmail()
{
    $data["mail_message"] = "Hello!";
    if(Mail::send('Emails.email', $data, function($message)
    {
        $message->from('webmaster@example.com', Input::get('name'));

        $message->to('amirhasan.hesam@gmail.com')->subject('Welcome to My Laravel app!');
    }))
    {
        return "success";
    }
    else
    {
        return Mail::failures();
    }
}

the Mail::failures() returns ["amirhasan.hesam@gmail.com"] with no specific error!

and this is my config on mail.php :

return [

'driver' => env('MAIL_DRIVER', 'smtp'),
'host' => env('MAIL_HOST', '*******'),
'port' => env('MAIL_PORT', 587),
'from' => ['address' => "****@*****", 'name' => "Diling"],
'encryption' => env('MAIL_ENCRYPTION', ''),
'username' => env('*****@*****'),
'password' => env('*************************'),
'sendmail' => '/usr/sbin/sendmail -bs',
'pretend' => false,

];

and I am using xamp right now to test the email. Any thoughts?

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