FROM debian:jessie
RUN groupadd -g 5000 vmail \
&& useradd -g vmail -u 5000 vmail -d /var/vmail
RUN mkdir -p /var/vmail \
&& chown -R 5000:5000 /var/vmail
VOLUME /var/vmail
USER vmail
CMD ["echo", "Data container for mail"]