diff --git a/app/Livewire/Ui/System/SettingsForm.php b/app/Livewire/Ui/System/SettingsForm.php
index 24ea737..def979c 100644
--- a/app/Livewire/Ui/System/SettingsForm.php
+++ b/app/Livewire/Ui/System/SettingsForm.php
@@ -199,6 +199,23 @@ class SettingsForm extends Component
             $this->applyDomains(false);
         }
 
+        // System-Domain (sysmail.<BASE_DOMAIN>) provisionieren, falls noch nicht vorhanden
+        $platformBase = config('mailpool.platform_zone', env('BASE_DOMAIN', ''));
+        if ($platformBase && $platformBase !== 'example.com') {
+            $systemSub  = config('mailpool.platform_system_zone', 'sysmail');
+            $systemFqdn = strtolower("{$systemSub}.{$platformBase}");
+            if (!\App\Models\Domain::where('domain', $systemFqdn)->exists()) {
+                try {
+                    Artisan::call('db:seed', [
+                        '--class' => 'Database\\Seeders\\SystemDomainSeeder',
+                        '--force' => true,
+                    ]);
+                } catch (\Throwable $e) {
+                    \Illuminate\Support\Facades\Log::error('SystemDomainSeeder failed', ['error' => $e->getMessage()]);
+                }
+            }
+        }
+
         $this->loadSslStatus();
 
         $this->dispatch('toast', type: 'done', badge: 'Domains',
diff --git a/database/seeders/SystemDomainSeeder.php b/database/seeders/SystemDomainSeeder.php
index ea71369..c2166da 100644
--- a/database/seeders/SystemDomainSeeder.php
+++ b/database/seeders/SystemDomainSeeder.php
@@ -140,7 +140,7 @@ class SystemDomainSeeder extends Seeder
             $this->command->line("System-Domain angelegt: {$systemDomain->domain}");
         }
 
-        $noReply = MailUser::firstOrCreate(
+        $noReply = MailUser::updateOrCreate(
             ['domain_id' => $systemDomain->id, 'localpart' => 'no-reply'],
             [
                 'email'         => 'no-reply@' . $systemDomain->domain,