gnu-social/docker/mail/Dockerfile

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/" \
	&& mkdir -p "/var/opendkim/keys/" \
	&& 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" \
	&& chown opendkim:opendkim "/var/opendkim/keys/"

# 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" \
	&& chmod +x "/usr/bin/start.sh"

# 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