Enable local IPv6

docker-compose.yml

@@ -268,10 +268,12 @@ services:
 networks:
   mailcow-network:
     driver: bridge
+    enable_ipv6: true
     ipam:
       driver: default
       config:
         - subnet: 172.22.1.0/24
+        - subnet: fd4d:6169:6c63:6f77::/64
 
 volumes:
   vmail-vol-1: