diff --git a/core/Dockerfile b/core/Dockerfile
index f935a08..f42bf2b 100644
--- a/core/Dockerfile
+++ b/core/Dockerfile
@@ -6,7 +6,7 @@ LABEL maintainer=az@zok.xyz \
 RUN mkdir -p /kopano/repo /kopano/data
 WORKDIR /kopano/repo
 
-ENV DEBIAN_FRONTEND noninteractive
+ARG DEBIAN_FRONTEND=noninteractive
 
 # install basics
 RUN apt-get update && \
@@ -17,34 +17,39 @@ RUN apt-get update && \
         moreutils \
         locales \
         apt-transport-https \
+        apt-utils jq \
         python3-minimal && \
     rm -rf /var/cache/apt /var/lib/apt/lists
 
-RUN curl -s -S -L -o /usr/local/bin/confix https://raw.githubusercontent.com/budhash/confix/master/confix && \
-    chmod +x /usr/local/bin/confix && \
-    sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \
+RUN sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \
     sed -i -e 's/# de_DE.UTF-8 UTF-8/de_DE.UTF-8 UTF-8/' /etc/locale.gen && \
     dpkg-reconfigure --frontend=noninteractive locales && \
     update-locale LANG=en_US.UTF-8 && \
     curl -s -S -L -o /usr/local/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.1/dumb-init_1.2.1_amd64 && \
     chmod a+x /usr/local/bin/dumb-init
 
-# If you have active Kopano subscription you can change KOPANO_CORE_REPOSITORY_URL to
-# https://serial:<YOURSERIAL>@download.kopano.io/supported/core:/final/Debian_9.0
-# and replace <YOURSERIAL> with your serial. You can also use pre-final or any other repository branch.
-# If you want to use community version please use images from hub.docker.com
 ARG KOPANO_CORE_VERSION=newest
 ARG KOPANO_REPOSITORY_BRANCH=master
-ARG KOPANO_CORE_REPOSITORY_URL="http://buildproxy/supported/core:/${KOPANO_REPOSITORY_BRANCH}/Debian_9.0"
+ARG KOPANO_CORE_REPOSITORY_URL="file:/kopano/repo"
 ARG KOPANO_REPOSITORY_FLAGS="trusted=yes"
-ARG NO_RELEASE_KEY_DOWNLOAD=0
+ARG DOWNLOAD_COMMUNITY_PACKAGES=1
+ARG RELEASE_KEY_DOWNLOAD=0
 ARG ADDITIONAL_KOPANO_PACKAGES
 
-# install kopano components
-RUN set -x && \
+# community build
+COPY download_community.sh /kopano/download_community.sh
+
+RUN \
+    # community download 
+    [ ${DOWNLOAD_COMMUNITY_PACKAGES} -eq 1 ] && \
+    chmod a+x /kopano/download_community.sh && \
+    /kopano/download_community.sh core && \
+    gzip -f9 Packages; \
+    # install
+    set -x && \
     echo ${KOPANO_CORE_VERSION} > /kopano/buildversion && \
     echo "deb [${KOPANO_REPOSITORY_FLAGS}] ${KOPANO_CORE_REPOSITORY_URL} ./" > /etc/apt/sources.list.d/kopano-core.list; \
-    (exit ${NO_RELEASE_KEY_DOWNLOAD}) && curl -s -S -o - "${KOPANO_CORE_REPOSITORY_URL}/Release.key" | apt-key add -; \
+    [ ${RELEASE_KEY_DOWNLOAD} -eq 1 ] && curl -s -S -o - "${KOPANO_CORE_REPOSITORY_URL}/Release.key" | apt-key add -; \
     apt-get update && \
     apt-get install --no-install-recommends -y \
         kopano-server-packages="${KOPANO_CORE_VERSION}" \
diff --git a/core/README.md b/core/README.md
index 52a90ee..449d618 100644
--- a/core/README.md
+++ b/core/README.md
@@ -15,8 +15,22 @@ The docker image kopano_ssl will create certificates for all containers. Those c
 
 kopano_webapp port 80 is meant to be published through a https reverse proxy. MAPI connection for Outlook is also handled over port 80.
 
-Maybe you need to execute `kopano-cli --list-users` once after initial install in the kopano_server container
-see https://documentation.kopano.io/kopanocore_administrator_manual/configure_kc_components.html#testing-ldap-configuration
+Maybe you need to execute `kopano-cli --list-users` once after initial install in the kopano_server container.
+
+See: https://documentation.kopano.io/kopanocore_administrator_manual/configure_kc_components.html#testing-ldap-configuration
 
 Example:
-`docker-compose exec kserver kopano-cli --list-users` (This may last very long without any console output.)
\ No newline at end of file
+
+`docker-compose exec kserver kopano-cli --list-users` (This may last very long without any console output.)
+
+
+Building supported Kopano
+=====
+If you have an active Kopano subscription you need specify the following build time arguments:
+- KOPANO_CORE_REPOSITORY_URL to `https://serial:<YOURSERIAL>@download.kopano.io/supported/core:/final/Debian_9.0`
+- RELEASE_KEY_DOWNLOAD to 1
+- DOWNLOAD_COMMUNITY_PACKAGES to 0
+
+Example:
+
+`docker build --build-arg KOPANO_CORE_REPOSITORY_URL=https://serial:ABC123456789@download.kopano.io/supported/core:/final/Debian_9.0 --build-arg RELEASE_KEY_DOWNLOAD=1 --build-arg DOWNLOAD_COMMUNITY_PACKAGES=0 https://github.com/zokradonh/kopano-docker.git#:core`
\ No newline at end of file
diff --git a/core/download_community.sh b/core/download_community.sh
new file mode 100644
index 0000000..a8cc17e
--- /dev/null
+++ b/core/download_community.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+
+function urldecode() { : "${*//+/ }"; echo -e "${_//%/\\x}"; }
+
+# query community server by h5ai API
+filename=$(curl -s -S -L -d "action=get&items%5Bhref%5D=%2Fcommunity%2F$1%3A%2F&items%5Bwhat%5D=1" -H \
+                "Accept: application/json" https://download.kopano.io/community/ | jq '.items[].href' | \
+                grep Debian_9.0-amd64 | sed 's#"##g' | sed "s#/community/$1:/##")
+
+filename=$(urldecode $filename)
+
+# download & extract packages
+curl -s -S -L -o $filename https://download.kopano.io/community/$1:/${filename}
+
+tar xf $filename
+
+# save disk space
+rm $filename
+
+# prepare directory to be apt source
+apt-ftparchive packages ${filename%.tar.gz} >> Packages
+
diff --git a/core/start-service.sh b/core/start-service.sh
index 02a8ebe..f3d0c2f 100644
--- a/core/start-service.sh
+++ b/core/start-service.sh
@@ -13,8 +13,9 @@ mkdir -p /kopano/data/attachments /tmp/$SERVICE_TO_START /var/run/kopano
 echo "Configure core service '$SERVICE_TO_START'" | ts
 /usr/bin/python3 /kopano/$SERVICE_TO_START.py
 
-echo "Set config ownership" | ts
-chown -R kopano:kopano /kopano/data /run /tmp
+echo "Set ownership" | ts
+chown -R kopano:kopano /run /tmp
+chown kopano:kopano /kopano/data/ /kopano/data/attachments
 
 echo "Clean old pid files and sockets" | ts
 rm -f /var/run/kopano/*