Abstract Mailer class for Laravel 5

Mailer.php

<?php namespace App\Services\Mailers;

abstract class Mailer {
    
    public function sendTo($user, $subject, $view, $data = [])
    {
        Mail::queue($view, $data, function($message) use ($user, $subject)
        {
            $message->to($user->email)->subject($subject);
        });
    }
    
}

UserMailer.php

<?php namespace App\Services\Mailers;

class UserMailer extends Mailer {
    
    public function welcome()
    {
        $view = 'emails.welcom';
        
        $data = [];
        
        $subject = 'Welcome to App';
        
        return $this->sendTo($user, subject, $view, $data);
        
    }
    
}