FROM debian:buster

EXPOSE 8891

RUN DEBIAN_FRONTEND=noninteractive && \
	apt-get update && \
	apt-get install -y --no-install-recommends \
		opendkim \
		opendkim-tools && \
	apt-get clean && \
	rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

VOLUME /etc/opendkim

ENTRYPOINT ["opendkim","-x","/etc/opendkim/opendkim.conf","-u","opendkim","-f"]