FROM alpine:3.8 RUN apk add --no-cache postfix postfix-pcre rsyslog \ python3 py3-pip \ && pip3 install --upgrade pip \ && pip3 install jinja2 podop tenacity COPY conf /conf COPY start.py /start.py EXPOSE 25/tcp 10025/tcp VOLUME ["/data"] CMD /start.py HEALTHCHECK CMD echo QUIT|nc localhost 25|grep "220 .* ESMTP Postfix"