new info form

app/UI/Client/Setting/Forms/InfoForm.php

@@ -39,7 +39,7 @@ class InfoForm extends BaseForm implements ClientArea
         $this->addField(new Hidden("selfdomain"));
         $field = new Text("mxthurdata");
         $field->setRawTitle('MX Eintrag ThurData Vorgabe');
-        $field->setHtmlAttributes(['disabled']);
+        $field->setHtmlAttributes(['readonly']);
         $this->addField($field);
         $field = new Text("mxactive");
         $field->setRawTitle('Aktueller MX Eintrag');