[PHP Laravel MESSAGE CONTROLLER: how to disable the multi user array to a single user]

I have a form which allow users to send emails, but on the form its showing different users that a user can send to. i want all users to send the email to only one admin. please help

 

$user_list = array();
        foreach($users as $user)
            $user_list[$user->id] = $user->name;

        $messages = Message::where('to_user_id','=',Auth::user()->id)
            ->where('delete_receiver','=','0')
            ->get();
        $count_inbox = count($messages);
        $count_sent = Message::where('from_user_id','=',Auth::user()->id)
            ->where('delete_sender','=','0')
            ->count();

        return view('message.compose',compact('user_list','count_inbox','count_sent'));
    }