ARG DISTRO=alpine:3.10 FROM $DISTRO # python3 shared with most images RUN apk add --no-cache \ python3 py3-pip git bash \ && pip3 install --upgrade pip # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube RUN pip3 install socrate # Shared layer between dovecot and postfix RUN pip3 install "podop>0.2.5" # Image specific layers under this line RUN apk add --no-cache \ dovecot dovecot-lmtpd dovecot-pop3d dovecot-submissiond dovecot-pigeonhole-plugin rspamd-client \ && mkdir /var/lib/dovecot COPY conf /conf COPY start.py /start.py EXPOSE 110/tcp 143/tcp 993/tcp 4190/tcp 2525/tcp VOLUME ["/data", "/mail"] CMD /start.py HEALTHCHECK --start-period=350s CMD echo QUIT|nc localhost 110|grep "Dovecot ready."