Don't redirect when webmail is served on '/'

core/nginx/conf/nginx.conf

@@ -87,7 +87,7 @@ http {
       include /overrides/*.conf;
 
       # Actual logic
-      {% if WEBROOT_REDIRECT %}
+      {% if WEBROOT_REDIRECT and WEB_WEBMAIL != '/' %}
       location / {
         return 301 {{ WEBROOT_REDIRECT }};
       }