diff --git a/docker/dinum-frontend/nginx/default.conf b/docker/dinum-frontend/nginx/default.conf
index bbb05726..6daead5c 100644
--- a/docker/dinum-frontend/nginx/default.conf
+++ b/docker/dinum-frontend/nginx/default.conf
@@ -13,20 +13,28 @@ server {
 
   # Manifest — fetched, never iframed
   location = /addons/outlook/manifest.xml {
-    alias /usr/share/nginx/html/addons/outlook/manifest.xml;
+      alias /usr/share/nginx/html/addons/outlook/manifest.xml;
 
-    add_header Access-Control-Allow-Origin "*";
-    add_header Cache-Control "no-cache, no-store, must-revalidate";
-    add_header X-Frame-Options "DENY";
-    add_header Content-Security-Policy "frame-ancestors 'none'";
+      add_header Access-Control-Allow-Origin "*";
+      add_header Cache-Control "no-cache, no-store, must-revalidate";
+      add_header X-Frame-Options "DENY";
+      add_header Content-Security-Policy "frame-ancestors 'none'";
   }
 
-  location ~* ^/addons/outlook/assets/.+\.(css|js|json|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
-    alias /usr/share/nginx/html/addons/outlook/assets/;
-    expires 30d;
-    add_header Cache-Control "public, max-age=2592000, immutable" always;
-    add_header Access-Control-Allow-Origin "*";
-    add_header Vary "Origin" always;
+  location = /addons/outlook/assets/ {
+      return 404;
+  }
+
+  location ~* ^/addons/outlook/assets/(.+\.(?:css|js|json|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot))/?$ {
+      root /usr/share/nginx/html;
+      expires 30d;
+      add_header Cache-Control "public, max-age=2592000, immutable" always;
+      add_header Access-Control-Allow-Origin "*";
+      add_header Vary "Origin" always;
+  }
+
+  location = /addons/outlook/ {
+      return 404;
   }
 
   location ~ ^/addons/outlook(/.*)?$ {