FROM debian:buster EXPOSE 25 465 587 RUN DEBIAN_FRONTEND=noninteractive && \ apt-get update && \ apt-get install -y --no-install-recommends \ postfix \ postfix-ldap \ rsyslog \ supervisor \ ca-certificates &&\ apt-get clean && \ rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ADD entrypoint.sh / RUN chmod +x /entrypoint.sh ADD supervisord.conf /etc/supervisor/conf.d/supervisord.conf VOLUME /var/spool/postfix #ENTRYPOINT ["/entrypoint.sh"] ENTRYPOINT ["supervisord"]