changes

Dockerfile

@@ -20,16 +20,16 @@ RUN \
     -e "s/dc_smarthost=''/dc_smarthost='${SMARTHOST}'/" \
     /etc/exim4/update-exim4.conf.conf && \
   env DEBIAN_FRONTEND=noninteractive dpkg-reconfigure -f debconf exim4-config && \
-  echo "root: ${ADMINUSER}" >> /etc/aliases && \
-  newaliases && \
   mkdir -p ${APP_DIR} && \
-  useradd -d ${APP_DIR} -u 1000 user
+  useradd -d ${APP_DIR} -u 1000 user && \
+  echo "root: ${ADMINUSER}" >> /etc/aliases && \
+  echo "user: ${ADMINUSER}" >> /etc/aliases && \
+  newaliases
 
 USER 1000:1000
 WORKDIR ${APP_DIR}
-VOLUME /etc/cron.d
-VOLUME ${APP_DIR}
 
+CMD [ "/usr/sbin/cron", "-f", "-L /dev/stdout" ]