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data/Dockerfiles/postfix/Dockerfile

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+From ubuntu:xenial
+MAINTAINER Andre Peters <andre.peters@servercow.de>
+
+ENV DEBIAN_FRONTEND noninteractive
+ENV LC_ALL C
+
+RUN dpkg-divert --local --rename --add /sbin/initctl \
+	&& ln -sf /bin/true /sbin/initctl \
+	&& dpkg-divert --local --rename --add /usr/bin/ischroot \
+	&& ln -sf /bin/true /usr/bin/ischroot
+
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends supervisor \
+	postfix \
+	sasl2-bin \
+	libsasl2-modules \
+	postfix \
+	postfix-mysql \
+	postfix-pcre \
+	syslog-ng \
+	syslog-ng-core \
+	ca-certificates
+
+RUN sed -i -E 's/^(\s*)system\(\);/\1unix-stream("\/dev\/log");/' /etc/syslog-ng/syslog-ng.conf
+
+COPY supervisord.conf /etc/supervisor/supervisord.conf
+COPY postfix.sh /opt/postfix.sh
+
+EXPOSE 588
+
+CMD exec /usr/bin/supervisord -c /etc/supervisor/supervisord.conf
+
+RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

data/Dockerfiles/postfix/postfix.sh

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+#!/bin/bash
+
+trap "postfix stop" EXIT
+
+sed -i "/^user/c\user = ${DBUSER}" /opt/postfix/conf/sql/*
+sed -i "/^password/c\password = ${DBPASS}" /opt/postfix/conf/sql/*
+sed -i "/^dbname/c\dbname = ${DBNAME}" /opt/postfix/conf/sql/*
+
+postconf -c /opt/postfix/conf
+if [[ $? != 0 ]]; then
+	echo "Postfix configuration error, refusing to start."
+	exit 1
+else
+	postfix -c /opt/postfix/conf start
+	sleep infinity
+fi

data/Dockerfiles/postfix/supervisord.conf

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+[supervisord]
+nodaemon=true
+
+[program:syslog-ng]
+command=/usr/sbin/syslog-ng --foreground  --no-caps
+redirect_stderr=true
+autostart=true
+stdout_syslog=true
+
+[program:postfix]
+command=/opt/postfix.sh
+autorestart=true
+
+[program:postfix-maillog]
+command=/usr/bin/tail -f /var/log/mail.log
+stdout_logfile=/dev/fd/1
+stdout_logfile_maxbytes=0