diff --git a/app/Livewire/Ui/System/SettingsForm.php b/app/Livewire/Ui/System/SettingsForm.php
index def979c..4d8d345 100644
--- a/app/Livewire/Ui/System/SettingsForm.php
+++ b/app/Livewire/Ui/System/SettingsForm.php
@@ -199,11 +199,13 @@ class SettingsForm extends Component
             $this->applyDomains(false);
         }
 
-        // System-Domain (sysmail.<BASE_DOMAIN>) provisionieren, falls noch nicht vorhanden
+        // System-Domain (sysmail.<MAIL_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}");
+            $mtaSub     = strtolower(env('MTA_SUB', 'mx') ?: 'mx');
+            $systemSub  = strtolower(config('mailpool.platform_system_zone', 'sysmail'));
+            $serverFqdn = strtolower("{$mtaSub}.{$platformBase}");
+            $systemFqdn = strtolower("{$systemSub}.{$serverFqdn}");
             if (!\App\Models\Domain::where('domain', $systemFqdn)->exists()) {
                 try {
                     Artisan::call('db:seed', [
diff --git a/database/seeders/SystemDomainSeeder.php b/database/seeders/SystemDomainSeeder.php
index c2166da..562df38 100644
--- a/database/seeders/SystemDomainSeeder.php
+++ b/database/seeders/SystemDomainSeeder.php
@@ -28,8 +28,8 @@ class SystemDomainSeeder extends Seeder
         $mtaSub = strtolower(env('MTA_SUB', 'mx') ?: 'mx');            // z.B. mx
         $systemSub = strtolower(config('mailpool.platform_system_zone') ?: 'sysmail'); // z.B. sysmail
 
-        $serverFqdn = strtolower("{$mtaSub}.{$platformBase}");     // mx.nexlab.at
-        $systemFqdn = strtolower("{$systemSub}.{$platformBase}");  // sysmail.nexlab.at
+        $serverFqdn = strtolower("{$mtaSub}.{$platformBase}");          // mx.nexlab.at
+        $systemFqdn = strtolower("{$systemSub}.{$serverFqdn}");         // sysmail.mx.nexlab.at
 
         // =========================================================================
         // 1) MAILSERVER-DOMAIN zuerst (mx.<BASE_DOMAIN>), is_server = true