[Config] Fix binding problems with IPv6 in newer Docker versions

docker-compose.yml

@@ -336,8 +336,8 @@ services:
         - ./data/conf/rspamd/meta_exporter:/meta_exporter:ro,z
         - sogo-web-vol-1:/usr/lib/GNUstep/SOGo/:z
       ports:
-        - "${HTTPS_BIND:-0.0.0.0}:${HTTPS_PORT:-443}:${HTTPS_PORT:-443}"
-        - "${HTTP_BIND:-0.0.0.0}:${HTTP_PORT:-80}:${HTTP_PORT:-80}"
+        - "${HTTPS_BIND:-:}:${HTTPS_PORT:-443}:${HTTPS_PORT:-443}"
+        - "${HTTP_BIND:-:}:${HTTP_PORT:-80}:${HTTP_PORT:-80}"
       restart: always
       networks:
         mailcow-network:

generate_config.sh

@@ -143,12 +143,14 @@ DBROOT=$(LC_ALL=C </dev/urandom tr -dc A-Za-z0-9 | head -c 28)
 # If you use a proxy within Docker, point it to the ports you set below.
 # Do _not_ use IP:PORT in HTTP(S)_BIND or HTTP(S)_PORT
 # IMPORTANT: Do not use port 8081, 9081 or 65510!
+# Example: HTTP_BIND=1.2.3.4
+# For IPv6 see https://mailcow.github.io/mailcow-dockerized-docs/firststeps-ip_bindings/
 
 HTTP_PORT=80
-HTTP_BIND=0.0.0.0
+HTTP_BIND=
 
 HTTPS_PORT=443
-HTTPS_BIND=0.0.0.0
+HTTPS_BIND=
 
 # ------------------------------
 # Other bindings

update.sh

@@ -556,6 +556,9 @@ fi
 
 # Checking for old project name bug
 sed -i --follow-symlinks 's#COMPOSEPROJECT_NAME#COMPOSE_PROJECT_NAME#g' mailcow.conf
+# Checking old, wrong bindings
+sed -i --follow-symlinks 's/HTTP_BIND=0.0.0.0/HTTP_BIND=/g' mailcow.conf
+sed -i --follow-symlinks 's/HTTPS_BIND=0.0.0.0/HTTPS_BIND=/g' mailcow.conf
 
 # Fix Rspamd maps
 if [ -f data/conf/rspamd/custom/global_from_blacklist.map ]; then