diff --git a/paperless-frontend/src/layouts/AppLayout.tsx b/paperless-frontend/src/layouts/AppLayout.tsx
index 5693bb6..e90e9a9 100644
--- a/paperless-frontend/src/layouts/AppLayout.tsx
+++ b/paperless-frontend/src/layouts/AppLayout.tsx
@@ -12,6 +12,7 @@ import {
   SunOutlined,
   MoonOutlined,
   AppstoreOutlined,
+  GlobalOutlined,
 } from '@ant-design/icons';
 import { useAuth } from '../auth/AuthContext';
 import { useTheme } from '../theme/ThemeContext';
@@ -27,6 +28,7 @@ type MenuItemDef = {
   label: string;
   permission?: Permission;
   countKey?: keyof StatsCounts;
+  externalUrl?: string;
 };
 
 const allMenuItems: MenuItemDef[] = [
@@ -35,6 +37,7 @@ const allMenuItems: MenuItemDef[] = [
   { key: '/posteingang', icon: <FileTextOutlined />, label: 'Posteingang', permission: Permission.VIEW_INBOX, countKey: 'posteingang' },
   { key: '/manuell', icon: <EditOutlined />, label: 'Manuell bearbeiten', permission: Permission.PROCESS_MANUALLY, countKey: 'manuell' },
   { key: '/mailpostfach', icon: <MailOutlined />, label: 'Mailpostfach', permission: Permission.VIEW_MAIL, countKey: 'mailpostfach' },
+  { key: 'agrarmonitor', icon: <GlobalOutlined />, label: 'In Agrarmonitor', permission: Permission.PROCESS_MANUALLY, countKey: 'agrarmonitor', externalUrl: 'https://admin7.agrarmonitor.de/dateien/eingang#dateien' },
   { key: '/settings', icon: <SettingOutlined />, label: 'Einstellungen', permission: Permission.MANAGE_SETTINGS },
 ];
 
@@ -148,7 +151,14 @@ export default function AppLayout() {
           mode="inline"
           selectedKeys={[selectedKey]}
           items={menuItems}
-          onClick={({ key }) => navigate(key)}
+          onClick={({ key }) => {
+            const item = allMenuItems.find((i) => i.key === key);
+            if (item?.externalUrl) {
+              window.open(item.externalUrl, '_blank', 'noopener,noreferrer');
+            } else {
+              navigate(key);
+            }
+          }}
           style={isDark ? { flex: 1 } : { background: 'transparent', flex: 1 }}
         />
 
diff --git a/paperless-frontend/src/pages/MailpostfachPage.tsx b/paperless-frontend/src/pages/MailpostfachPage.tsx
index 306bff0..d6ac553 100644
--- a/paperless-frontend/src/pages/MailpostfachPage.tsx
+++ b/paperless-frontend/src/pages/MailpostfachPage.tsx
@@ -19,7 +19,8 @@ export default function MailpostfachPage() {
   const [searchText, setSearchText] = useState(() => sessionStorage.getItem('mailSearch') || '');
   const [statusFilter, setStatusFilter] = useState<number | 'all'>(() => {
     const saved = sessionStorage.getItem('mailStatus');
-    return saved !== null && saved !== 'all' ? Number(saved) : 'all';
+    if (saved === null) return 0;
+    return saved === 'all' ? 'all' : Number(saved);
   });
   const { hasPermission } = useAuth();