ninedocker/misc/images/mta/containers/Dockerfile

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FROM debian:buster-slim
RUN set -eux; \
apt-get update; \
apt-get install -y \
exim4-daemon-light \
tini \
; \
rm -rf /var/lib/apt/lists/*; \
ln -svfT /etc/hostname /etc/mailname
# https://blog.dhampir.no/content/exim4-line-length-in-debian-stretch-mail-delivery-failed-returning-message-to-sender
# https://serverfault.com/a/881197
# https://bugs.debian.org/828801
RUN echo "IGNORE_SMTP_LINE_LENGTH_LIMIT='true'" >> /etc/exim4/exim4.conf.localmacros
RUN set -eux; \
mkdir -p /var/spool/exim4 /var/log/exim4; \
chown -R Debian-exim:Debian-exim /var/spool/exim4 /var/log/exim4
COPY set-exim4-update-conf docker-entrypoint.sh /usr/local/bin/
RUN set -eux; \
set-exim4-update-conf \
dc_eximconfig_configtype 'internet' \
dc_hide_mailname 'true' \
dc_local_interfaces '0.0.0.0 ; ::0' \
dc_other_hostnames '' \
dc_relay_nets '0.0.0.0/0' \
;
EXPOSE 25
ENTRYPOINT ["docker-entrypoint.sh"]
CMD ["exim", "-bd", "-v"]