WitShop/app/Http/Controllers/Admin/NewsletterController.php

<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\NewsletterSubscriber;

class NewsletterController extends Controller
{
    public function index()
    {
        $subscribers = NewsletterSubscriber::orderByDesc('created_at')->get();
        return view('admin.newsletter.index', compact('subscribers'));
    }

    public function export()
    {
        $rows = NewsletterSubscriber::whereNotNull('confirmed_at')
            ->orderBy('email')
            ->pluck('email');

        $csv = "E-Mail\n" . $rows->implode("\n");

        return response($csv, 200, [
            'Content-Type'        => 'text/csv; charset=UTF-8',
            'Content-Disposition' => 'attachment; filename="newsletter-' . date('Y-m-d') . '.csv"',
        ]);
    }

    public function destroy(NewsletterSubscriber $subscriber)
    {
        $subscriber->delete();
        return back()->with('success', 'Abonnent gelöscht.');
    }
}