Replace Provider with Subscriber

src/MailViewerServiceProvider.php

@@ -2,9 +2,10 @@
 
 namespace Label84\MailViewer;
 
+use Illuminate\Support\Facades\Event;
 use Illuminate\Support\Facades\Route;
 use Illuminate\Support\ServiceProvider;
-use Label84\MailViewer\Providers\EventServiceProvider;
+use Label84\MailViewer\Subscribers\MessageSentSubscriber;
 
 class MailViewerServiceProvider extends ServiceProvider
 {
@@ -38,7 +39,7 @@ public function register(): void
             'mailviewer'
         );
 
-        $this->app->register(EventServiceProvider::class);
+        Event::subscribe(MessageSentSubscriber::class);
     }
 
     protected function registerRoutes(): void

src/Subscribers/MessageSentSubscriber.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Label84\MailViewer\Subscribers;
+
+use Illuminate\Events\Dispatcher;
+use Illuminate\Mail\Events\MessageSent;
+use Label84\MailViewer\Listeners\CreateMailViewerItem;
+
+class MessageSentSubscriber
+{
+    public function subscribe(Dispatcher $events): void
+    {
+        $events->listen(MessageSent::class, [CreateMailViewerItem::class, 'handle']);
+    }
+}