$support_email = 'addon.akbar@gmail.com';
define('SUPPORT_EMAIL', $support_email);

public function testcron(){

        $email = new Email('default');
        $email->from(['aon.akbarali@gmail.com' => 'My Site'])
            ->to('aon.ashish@gmail.com')
            ->subject('About')
            ->send('My message');
    }