public function send(SendRequest $request){
    $subscribers = Subscriber::all();
    foreach ($subscribers as $subscriber) {    
        Mail::send('emails.campaign', [
            'name' => $subscriber->firstname,
            'title'=> $request->title ,
            'content' => $request->message 
        ], function ($message) use ($subscriber) {
            $message->from('og@emailplatform.com', 'Email Platform');
            $message->to($subscriber->email);
            $message->subject($title);
        });
    }  
    return back()->with([
    'success' => "Campaign Sent!"
    ]);
}