First version.

Dockerfile

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+#Dockerfile for a Postfix email relay service
+FROM centos:latest
+MAINTAINER Juan Luis Baptiste juan.baptiste@gmail.com
+
+RUN yum install -y epel-release && yum update -y && \
+    yum install -y cyrus-sasl cyrus-sasl-plain cyrus-sasl-md5 mailx \ 
+    perl supervisor postfix
+RUN sed -i -e "s/^nodaemon=false/nodaemon=true/" /etc/supervisord.conf
+RUN sed -i -e 's/inet_interfaces = localhost/inet_interfaces = all/g' /etc/postfix/main.cf
+COPY run.sh /
+RUN chmod +x /run.sh
+COPY etc/supervisord.d/postfix.ini /etc/supervisord.d/
+
+EXPOSE 25
+#ENTRYPOINT ["/run.sh"]
+CMD ["/run.sh"]