Ajout d’une passerelle de messagerie pour les conteneurs.

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"]