ARG DISTRO=alpine:3.12 FROM $DISTRO # python3 shared with most images RUN apk add --no-cache \ python3 py3-pip git bash py3-multidict py3-yarl \ && pip3 install --upgrade pip # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube RUN pip3 install socrate==0.2.0 # Shared layer between dovecot and postfix RUN pip3 install "podop>0.2.5" # Image specific layers under this line RUN apk add --no-cache postfix postfix-pcre cyrus-sasl-plain rsyslog cyrus-sasl-login COPY conf /conf COPY start.py /start.py EXPOSE 25/tcp 10025/tcp VOLUME ["/queue"] CMD /start.py HEALTHCHECK --start-period=350s CMD echo QUIT|nc localhost 25|grep "220 .* ESMTP Postfix"