Use a hostname

webmails/nginx-webmail.conf

@@ -1,6 +1,7 @@
 server {
     listen 80 default_server;
     listen [::]:80 default_server;
+    resolver {{ RESOLVER }} valid=30s;
 
 {% if WEBMAIL == 'roundcube' %}
     root /var/www/{{ WEBMAIL }}/public_html;
@@ -27,12 +28,7 @@ server {
     add_header Referrer-Policy "no-referrer" always;
 
     real_ip_header X-Real-IP;
-    {% for from_ip in SUBNET.split(',') %}
-    set_real_ip_from {{ from_ip }};
-    {% endfor %}
-    {% if SUBNET6 %}{% for from_ip in SUBNET6.split(',') %}
-    set_real_ip_from {{ from_ip }};
-    {% endfor %}{% endif %}
+    set_real_ip_from {{ FRONT_ADDRESS or "front" }};
 
     location / {
         try_files $uri $uri/ /index.php$args;