FROM debian:buster-slim ENV DEBIAN_FRONTEND=noninteractive # Install packages RUN \ apt-get update \ && apt-get upgrade -y \ && apt-get install -y --no-install-recommends \ dovecot-core \ dovecot-imapd \ dovecot-lmtpd \ dovecot-pop3d \ opendkim \ opendkim-tools \ openssl \ postfix \ procps \ rsyslog \ s6 \ && apt-get autoclean \ && apt-get autoremove # Setup folders and users RUN \ groupadd -g 2222 vmail \ && mkdir -p -m 751 "/var/mail/" \ && mkdir -p -m 755 "/etc/mail/" \ && useradd -d "/var/mail" -M -s "/usr/sbin/nologin" -u 2222 -g 2222 vmail \ && usermod -aG vmail postfix \ && usermod -aG vmail dovecot \ && usermod -aG vmail opendkim\ && chown vmail:vmail "/var/mail" # Copy config files COPY rootfs/ / RUN \ chmod +x "/etc/service/postfix/run" \ && chmod +x "/etc/service/dovecot/run" \ && chmod +x "/etc/service/opendkim/run" \ && chmod +x "/etc/service/rsyslog/run" # Prepare user RUN \ mkdir -p "/var/mail/${DOMAINNAME}" \ && mkdir -p "/var/mail/${DOMAINPART}/${USER@*}" \ && chown vmail:vmail "/var/mail/${DOMAINNAME}" \ && chown vmail:vmail "/var/mail/${DOMAINPART}/${USER@*}" # Expose ports EXPOSE 25 110 143 587 993 995 # Run start script ENTRYPOINT /usr/bin/start.sh