diff --git a/update.sh b/update.sh
index 647071ac..b81847fa 100755
--- a/update.sh
+++ b/update.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 for bin in curl docker-compose docker git awk sha1sum; do
-	if [[ -z $(which ${bin}) ]]; then echo "Cannot find ${bin}, exiting..."; exit 1; fi
+  if [[ -z $(which ${bin}) ]]; then echo "Cannot find ${bin}, exiting..."; exit 1; fi
 done
 
 [[ ! -f mailcow.conf ]] && { echo "mailcow.conf is missing"; exit 1;}
@@ -9,44 +9,57 @@ done
 CONFIG_ARRAY=("SKIP_LETS_ENCRYPT" "USE_WATCHDOG" "WATCHDOG_NOTIFY_EMAIL" "SKIP_CLAMD" "SKIP_IP_CHECK" "SKIP_FAIL2BAN" "ADDITIONAL_SAN" "DOVEADM_PORT")
 sed -i '$a\' mailcow.conf
 for option in ${CONFIG_ARRAY[@]}; do
-	if [[ ${option} == "ADDITIONAL_SAN" ]]; then
-		if ! grep -q ${option} mailcow.conf; then
-			echo "Adding new option \"${option}\" to mailcow.conf"
-			echo "${option}=" >> mailcow.conf
-		fi
-	elif [[ ${option} == "COMPOSE_PROJECT_NAME" ]]; then
-		if ! grep -q ${option} mailcow.conf; then
-			echo "Adding new option \"${option}\" to mailcow.conf"
-			echo "COMPOSE_PROJECT_NAME=mailcow-dockerized" >> mailcow.conf
-		fi
-	elif [[ ${option} == "DOVEADM_PORT" ]]; then
-		if ! grep -q ${option} mailcow.conf; then
-			echo "Adding new option \"${option}\" to mailcow.conf"
-			echo "DOVEADM_PORT=127.0.0.1:19991" >> mailcow.conf
-		fi
-	elif [[ ${option} == "WATCHDOG_NOTIFY_EMAIL" ]]; then
-		if ! grep -q ${option} mailcow.conf; then
-			echo "Adding new option \"${option}\" to mailcow.conf"
-			echo "WATCHDOG_NOTIFY_EMAIL=" >> mailcow.conf
-		fi
+  if [[ ${option} == "ADDITIONAL_SAN" ]]; then
+    if ! grep -q ${option} mailcow.conf; then
+      echo "Adding new option \"${option}\" to mailcow.conf"
+      echo "${option}=" >> mailcow.conf
+    fi
+  elif [[ ${option} == "COMPOSE_PROJECT_NAME" ]]; then
+    if ! grep -q ${option} mailcow.conf; then
+      echo "Adding new option \"${option}\" to mailcow.conf"
+      echo "COMPOSE_PROJECT_NAME=mailcow-dockerized" >> mailcow.conf
+    fi
+  elif [[ ${option} == "DOVEADM_PORT" ]]; then
+    if ! grep -q ${option} mailcow.conf; then
+      echo "Adding new option \"${option}\" to mailcow.conf"
+      echo "DOVEADM_PORT=127.0.0.1:19991" >> mailcow.conf
+    fi
+  elif [[ ${option} == "WATCHDOG_NOTIFY_EMAIL" ]]; then
+    if ! grep -q ${option} mailcow.conf; then
+      echo "Adding new option \"${option}\" to mailcow.conf"
+      echo "WATCHDOG_NOTIFY_EMAIL=" >> mailcow.conf
+    fi
   elif [[ ${option} == "LOG_LINES" ]]; then
     if ! grep -q ${option} mailcow.conf; then
       echo "Adding new option \"${option}\" to mailcow.conf"
+      echo '# Max log lines per service to keep in Redis logs' >> mailcow.conf
       echo "LOG_LINES=9999" >> mailcow.conf
     fi
-	elif ! grep -q ${option} mailcow.conf; then
-		echo "Adding new option \"${option}\" to mailcow.conf"
-		echo "${option}=n" >> mailcow.conf
-	fi
+  elif [[ ${option} == "IPV4_NETWORK" ]]; then
+    if ! grep -q ${option} mailcow.conf; then
+      echo "Adding new option \"${option}\" to mailcow.conf"
+      echo '# Internal IPv4 /24 subnet, format n.n.n. (expands to n.n.n.0/24)' >> mailcow.conf
+      echo "IPV4_NETWORK=172.22.1" >> mailcow.conf
+    fi
+  elif [[ ${option} == "IPV6_NETWORK" ]]; then
+    if ! grep -q ${option} mailcow.conf; then
+      echo "Adding new option \"${option}\" to mailcow.conf"
+      echo '# Internal IPv6 subnet in fd00::/8' >> mailcow.conf
+      echo "IPV6_NETWORK=fd4d:6169:6c63:6f77::/64" >> mailcow.conf
+    fi
+  elif ! grep -q ${option} mailcow.conf; then
+    echo "Adding new option \"${option}\" to mailcow.conf"
+    echo "${option}=n" >> mailcow.conf
+  fi
 done
 
 echo -en "Checking internet connection... "
 curl -o /dev/null google.com -sm3
 if [[ $? != 0 ]]; then
-	echo -e "\e[31mfailed\e[0m"
-	exit 1
-else
-	echo -e "\e[32mOK\e[0m"
+  echo -e "\e[31mfailed\e[0m"
+  exit 1
+  else
+  echo -e "\e[32mOK\e[0m"
 fi
 
 set -o pipefail
@@ -56,22 +69,22 @@ BRANCH=$(git rev-parse --abbrev-ref HEAD)
 declare -a DC_PARAMS
 
 while (($#)); do
-case "${1}" in
-	--check|-c)
-		echo "Checking remote code for updates..."
-		git fetch origin ${BRANCH}
-		if ! git diff origin/${BRANCH} --quiet; then
-			echo "Updated code is available."
-			exit 0
-		else
-			echo "No updates available."
-			exit 3
-		fi
-	;;
-  --no-start)
-    DC_PARAMS=(${DC_PARAMS[@]} "--no-start")
-  ;;
-esac
+  case "${1}" in
+    --check|-c)
+      echo "Checking remote code for updates..."
+      git fetch origin ${BRANCH}
+      if ! git diff origin/${BRANCH} --quiet; then
+        echo "Updated code is available."
+        exit 0
+      else
+        echo "No updates available."
+        exit 3
+      fi
+    ;;
+    --no-start)
+      DC_PARAMS=(${DC_PARAMS[@]} "--no-start")
+    ;;
+  esac
 done
 
 echo -e "\e[32mChecking for newer update script...\e[0m"
@@ -80,22 +93,22 @@ git fetch origin ${BRANCH}
 git checkout origin/${BRANCH} update.sh
 SHA1_2=$(sha1sum update.sh)
 if [[ ${SHA1_1} != ${SHA1_2} ]]; then
-	echo "update.sh changed, please run this script again, exiting."
-	chmod +x update.sh
-	exit 0
+  echo "update.sh changed, please run this script again, exiting."
+  chmod +x update.sh
+  exit 0
 fi
 
 if [[ -f mailcow.conf ]]; then
-	source mailcow.conf
-else
-	echo -e "\e[31mNo mailcow.conf - is mailcow installed?\e[0m"
-	exit 1
+  source mailcow.conf
+  else
+  echo -e "\e[31mNo mailcow.conf - is mailcow installed?\e[0m"
+  exit 1
 fi
 
 read -r -p "Are you sure you want to update mailcow: dockerized? All containers will be stopped. [y/N] " response
 if [[ ! "$response" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
-	echo "OK, exiting."
-	exit 0
+  echo "OK, exiting."
+  exit 0
 fi
 
 echo -e "Stopping mailcow... "
@@ -115,31 +128,31 @@ git merge -Xtheirs -Xpatience -m "After update on ${DATE}"
 # Need to use a variable to not pass return codes of if checks
 MERGE_RETURN=$?
 if [[ ${MERGE_RETURN} == 128 ]]; then
-	echo -e "\e[31m\nOh no, what happened?\n=> You most likely added files to your local mailcow instance that were now added to the official mailcow repository. Please move them to another location before updating mailcow.\e[0m"
-	exit 1
+  echo -e "\e[31m\nOh no, what happened?\n=> You most likely added files to your local mailcow instance that were now added to the official mailcow repository. Please move them to another location before updating mailcow.\e[0m"
+  exit 1
 elif [[ ${MERGE_RETURN} == 1 ]]; then
-	echo -e "\e[93mPotenial conflict, trying to fix...\e[0m"
-	git status --porcelain | grep -E "UD|DU" | awk '{print $2}' | xargs rm -v
-	git add -A
-	git commit -m "After update on ${DATE}" > /dev/null
-	git checkout .
-	echo -e "\e[32mRemoved and recreated files if necessary.\e[0m"
+  echo -e "\e[93mPotenial conflict, trying to fix...\e[0m"
+  git status --porcelain | grep -E "UD|DU" | awk '{print $2}' | xargs rm -v
+  git add -A
+  git commit -m "After update on ${DATE}" > /dev/null
+  git checkout .
+  echo -e "\e[32mRemoved and recreated files if necessary.\e[0m"
 elif [[ ${MERGE_RETURN} != 0 ]]; then
-	echo -e "\e[31m\nOh no, something went wrong. Please check the error message above.\e[0m"
-	echo
-	echo "Run docker-compose up -d to restart your stack without updates or try again after fixing the mentioned errors."
-	exit 1
+  echo -e "\e[31m\nOh no, something went wrong. Please check the error message above.\e[0m"
+  echo
+  echo "Run docker-compose up -d to restart your stack without updates or try again after fixing the mentioned errors."
+  exit 1
 fi
 
 
 echo -e "\e[32mFetching new docker-compose version...\e[0m"
 sleep 2
 if [[ $(curl -sL -w "%{http_code}" https://www.servercow.de/docker-compose/latest.php -o /dev/null) == "200" ]]; then
-	LATEST_COMPOSE=$(curl -#L https://www.servercow.de/docker-compose/latest.php)
-	curl -#L https://github.com/docker/compose/releases/download/${LATEST_COMPOSE}/docker-compose-$(uname -s)-$(uname -m) > $(which docker-compose)
-	chmod +x $(which docker-compose)
-else
-	echo -e "\e[33mCannot determine latest docker-compose version, skipping...\e[0m"
+  LATEST_COMPOSE=$(curl -#L https://www.servercow.de/docker-compose/latest.php)
+  curl -#L https://github.com/docker/compose/releases/download/${LATEST_COMPOSE}/docker-compose-$(uname -s)-$(uname -m) > $(which docker-compose)
+  chmod +x $(which docker-compose)
+  else
+  echo -e "\e[33mCannot determine latest docker-compose version, skipping...\e[0m"
 fi
 
 echo -e "\e[32mFetching new images, if any...\e[0m"
@@ -157,43 +170,42 @@ docker-compose up -d --remove-orphans ${DC_PARAMS[@]}
 echo -e "\e[32mCollecting garbage...\e[0m"
 IMGS_TO_DELETE=()
 for container in $(grep -oP "image: \Kmailcow.+" docker-compose.yml); do
-	REPOSITORY=${container/:*}
-	TAG=${container/*:}
-	V_MAIN=${container/*.}
-	V_SUB=${container/*.}
+  REPOSITORY=${container/:*}
+  TAG=${container/*:}
+  V_MAIN=${container/*.}
+  V_SUB=${container/*.}
+  EXISTING_TAGS=$(docker images | grep ${REPOSITORY} | awk '{ print $2 }')
+  for existing_tag in ${EXISTING_TAGS[@]}; do
+    V_MAIN_EXISTING=${existing_tag/*.}
+    V_SUB_EXISTING=${existing_tag/*.}
+    # Not an integer
+    [[ ! $V_MAIN_EXISTING =~ ^[0-9]+$ ]] && continue
+    [[ ! $V_SUB_EXISTING =~ ^[0-9]+$ ]] && continue
 
-	EXISTING_TAGS=$(docker images | grep ${REPOSITORY} | awk '{ print $2 }')
-	for existing_tag in ${EXISTING_TAGS[@]}; do
-		V_MAIN_EXISTING=${existing_tag/*.}
-		V_SUB_EXISTING=${existing_tag/*.}
-
-		# Not an integer
-		[[ ! $V_MAIN_EXISTING =~ ^[0-9]+$ ]] && continue
-		[[ ! $V_SUB_EXISTING =~ ^[0-9]+$ ]] && continue
-
-		if [[ $V_MAIN_EXISTING == "latest" ]]; then
-			echo "Found deprecated label \"latest\" for repository $REPOSITORY, it should be deleted."
-			IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
-		elif [[ $V_MAIN_EXISTING -lt $V_MAIN ]]; then
-			echo "Found tag $existing_tag for $REPOSITORY, which is older than the current tag $TAG and should be deleted."
-			IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
-		elif [[ $V_SUB_EXISTING -lt $V_SUB ]]; then
-			echo "Found tag $existing_tag for $REPOSITORY, which is older than the current tag $TAG and should be deleted."
-			IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
-		fi
-	done
+    if [[ $V_MAIN_EXISTING == "latest" ]]; then
+      echo "Found deprecated label \"latest\" for repository $REPOSITORY, it should be deleted."
+      IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
+    elif [[ $V_MAIN_EXISTING -lt $V_MAIN ]]; then
+      echo "Found tag $existing_tag for $REPOSITORY, which is older than the current tag $TAG and should be deleted."
+      IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
+    elif [[ $V_SUB_EXISTING -lt $V_SUB ]]; then
+      echo "Found tag $existing_tag for $REPOSITORY, which is older than the current tag $TAG and should be deleted."
+      IMGS_TO_DELETE+=($REPOSITORY:$existing_tag)
+    fi
+  done
 done
+
 if [[ ! -z ${IMGS_TO_DELETE[*]} ]]; then
-	echo "Run the following command to delete unused image tags:"
-	echo
-	echo "    docker rmi ${IMGS_TO_DELETE[*]}"
-	echo
-	read -r -p "Do you want to delete old image tags right now? [y/N] " response
-	if [[ "$response" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
-		docker rmi ${IMGS_TO_DELETE[*]}
-	else
-		echo "OK, skipped."
-	fi
+  echo "Run the following command to delete unused image tags:"
+  echo
+  echo "    docker rmi ${IMGS_TO_DELETE[*]}"
+  echo
+  read -r -p "Do you want to delete old image tags right now? [y/N] " response
+  if [[ "$response" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
+    docker rmi ${IMGS_TO_DELETE[*]}
+    else
+    echo "OK, skipped."
+  fi
 fi
 echo -e "\e[32mFurther cleanup...\e[0m"
 echo "If you want to cleanup further garbage collected by Docker, please make sure all containers are up and running before cleaning your system by executing \"docker system prune\""