improve code

Application/Controller/Admin/SpfChecker.php

@@ -22,6 +22,7 @@ use Mika56\SPFCheck\Model\Query;
 use Mika56\SPFCheck\Model\Result;
 use Mika56\SPFCheck\SPFCheck;
 use OxidEsales\Eshop\Application\Controller\Admin\AdminDetailsController;
+use OxidEsales\Eshop\Application\Model\Shop;
 use OxidEsales\Eshop\Core\Registry;
 
 class SpfChecker extends AdminDetailsController
@@ -50,6 +51,9 @@ class SpfChecker extends AdminDetailsController
 
     protected function getMailDomains()
     {
+        /** @var Shop $shop */
+        $shop = Registry::getConfig()->getActiveShop();
+
         return
             array_filter(
                 array_unique(
@@ -68,9 +72,9 @@ class SpfChecker extends AdminDetailsController
                             }
                         },
                         [
-                            Registry::getConfig()->getActiveShop()->getFieldData('oxinfoemail'),
-                            Registry::getConfig()->getActiveShop()->getFieldData('oxorderemail'),
-                            Registry::getConfig()->getActiveShop()->getFieldData('oxowneremail'),
+                            $shop->getFieldData('oxinfoemail'),
+                            $shop->getFieldData('oxorderemail'),
+                            $shop->getFieldData('oxowneremail'),
                         ]
                     )
                 )