Postfix, initial release

Dockerfile

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+FROM alpine:edge
+MAINTAINER Bojan Cekrlic
+
+# You can set this variables when running the image to override the host name or
+# foward the messages to another server
+#ENV	HOSTNAME
+#ENV	RELAYHOST
+
+RUN	true && \
+	apk add --no-cache --update postfix ca-certificates supervisor rsyslog bash && \
+	(rm "/tmp/"* 2>/dev/null || true) && (rm -rf /var/cache/apk/* 2>/dev/null || true)
+
+COPY	supervisord.conf /etc/supervisord.conf
+COPY	rsyslog.conf /etc/rsyslog.conf
+COPY	postfix.sh /postfix.sh
+RUN	chmod +x /postfix.sh
+
+VOLUME	[ "/var/spool/postfix" ]
+
+USER	root
+WORKDIR	/tmp
+ENTRYPOINT ["/usr/bin/supervisord", "-c", "/etc/supervisord.conf"]
+

postfix.sh

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+#!/bin/bash
+
+if [[ ! -z "$HOSTNAME" ]]; then
+	postconf -e myhostname=$HOSTNAME
+else
+	postconf -# myhostname
+fi
+
+if [[ ! -z "$RELAYHOST" ]]; then
+	postconf -e relayhost=$RELAYHOST
+else
+	postconf -# relayhost
+fi
+
+/usr/sbin/postfix -c /etc/postfix start

rsyslog.conf

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+$ModLoad immark.so # provides --MARK-- message capability
+$ModLoad imuxsock.so # provides support for local system logging (e.g. via logger command)
+
+# default permissions for all log files.
+$FileOwner root
+$FileGroup adm
+$FileCreateMode 0640
+$DirCreateMode 0755
+$Umask 0022
+
+#*.info							/dev/stdout
+#mail.*							/dev/stdout
+mail.info	/dev/stdout
+

supervisord.conf

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+[supervisord]
+nodaemon        = true
+logfile         = /dev/null
+logfile_maxbytes= 0
+
+[program:rsyslog]
+command         = rsyslogd -n
+autostart       = true
+autorestart     = true
+startsecs       = 2
+stopwaitsecs    = 2
+stdout_logfile  = /dev/stdout
+stderr_logfile  = /dev/stderr
+stdout_logfile_maxbytes = 0
+stderr_logfile_maxbytes = 0
+
+[program:postfix]
+process_name	= master
+directory	= /etc/postfix
+command		= /postfix.sh
+startsecs	= 0
+autorestart	= false