diff --git a/Dockerfile b/Dockerfile
index f4f7bdd..35c6379 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ COPY --from=portage /var/db/repos/gentoo /var/db/repos/gentoo
 
 # courier and pythonfilter install + activate + cleanup
 RUN echo '=mail-filter/courier-pythonfilter-3.0.2-r1' > /etc/portage/package.accept_keywords && \
-	emerge mail-mta/courier mail-filter/courier-pythonfilter dev-python/pyspf dev-python/pydns && \
+	emerge mail-mta/courier mail-filter/courier-pythonfilter dev-python/pyspf && \
 	ln -s /usr/bin/pythonfilter /usr/libexec/filters && \
 	filterctl start pythonfilter && \
 	rm -rf /var/db/repos/gentoo
diff --git a/README.md b/README.md
index f77cd6a..1d4893a 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,10 @@
 Docker image providing full [Courier MTA](http://www.courier-mta.org/) suite (not just IMAP)
 
 # Usage
-1. `git clone https://github.com/tuxmainy/docker-courier.git`
-2. `cp env.example .env`
-3. edit .env
-4. make sure volume directories are present
-5. `docker-compose up -d`
+1. `cp env.example .env`
+2. edit .env
+3. make sure volume directories are present
+4. `docker-compose up -d`
 
 # add users
 1. `echo -n 'mypassword' |openssl sha256 -binary |base64`
diff --git a/docker-compose.yml b/docker-compose.yml
index 780d495..18d3962 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,32 +1,38 @@
 version: "3.7"
 
 services:
-        server:
-                build:
-                        context: .
-                network_mode: bridge
-                ports:
-                        - "138.201.55.55:25:25"
-                        - "138.201.55.55:143:143"
-                        - "138.201.55.55:993:993"
-                        - "2a01:4f8:172:101f::2:25:25"
-                        - "2a01:4f8:172:101f::2:143:143"
-                        - "2a01:4f8:172:101f::2:993:993"
-                volumes:
-                        - conf:/etc/courier
-                        - mail:/mail
-                        - /dev/log:/dev/log
-                hostname: devloop.de
-                restart: always
-volumes:
-        conf:
-                driver_opts:
-                        type: "none"
-                        o: "bind"
-                        device: "${DATA_BASE}/conf"
-        mail:
-                driver_opts:
-                        type: "none"
-                        o: "bind"
-                        device: "${DATA_BASE}/mail"
+  server:
+    build:
+      context: .
+    container_name: mail.devloop.de
+    networks:
+      - internal_mail
+    ports:
+      - "138.201.55.55:25:25"
+      - "138.201.55.55:143:143"
+      - "138.201.55.55:993:993"
+      - "2a01:4f8:172:101f::2:25:25"
+      - "2a01:4f8:172:101f::2:143:143"
+      - "2a01:4f8:172:101f::2:993:993"
+    volumes:
+      - conf:/conf
+      - mail:/mail
+      - /dev/log:/dev/log
+    hostname: devloop.de
+    restart: always
 
+networks:
+  internal_mail:
+    name: internal_mail
+
+volumes:
+  conf:
+    driver_opts:
+      type: "none"
+      o: "bind"
+      device: "${DATA}/conf"
+  mail:
+    driver_opts:
+      type: "none"
+      o: "bind"
+      device: "${DATA}/mail"
diff --git a/env.example b/env.example
index bab7066..14341a0 100644
--- a/env.example
+++ b/env.example
@@ -1,2 +1,2 @@
 COMPOSE_PROJECT_NAME=courier
-DATA_BASE=/path/to/my/basedir/containing/maildirandconf
+DATA=/path/to/my/basedir/containing/maildirandconf