add docker version

docker/smtp/Dockerfile

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+FROM debian:stable-slim
+# FROM bitnami/minideb:latest
+
+LABEL maintainer="Ludovic CANDELLIER <ludo@huma.net>"
+
+# Set Environment Variables
+ENV DEBIAN_FRONTEND noninteractive
+
+# Start as root
+USER root
+
+# always run apt update when start and after add new source list, then clean up at end.
+RUN apt-get update -yqq; \
+    apt-get upgrade -yqq; \
+    apt-get -yqq install --no-install-recommends apt-utils procps rsyslog apt-transport-https lsb-release ca-certificates curl wget \
+    logrotate postfix
+
+COPY ./conf/main.cf /etc/postfix/main.cf
+
+# RUN ln -snf /etc/services /var/spool/postfix/etc/services
+
+COPY run.sh /
+RUN chmod +x /run.sh
+
+RUN /etc/init.d/postfix start
+
+# Clean up
+RUN apt-get clean && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
+    rm /var/log/lastlog /var/log/faillog
+
+# CMD ["/bin/bash", "/run.sh"]
+
+# Set default work directory
+WORKDIR /var
+
+EXPOSE 25

docker/smtp/conf/main.cf

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+# See /usr/share/postfix/main.cf.dist for a commented, more complete version
+
+
+# Debian specific:  Specifying a file name will cause the first
+# line of that file to be used as the name.  The Debian default
+# is /etc/mailname.
+#myorigin = /etc/mailname
+myorigin = $mydomain
+
+smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
+biff = no
+
+# appending .domain is the MUA's job.
+append_dot_mydomain = no
+
+# Uncomment the next line to generate "delayed mail" warnings
+#delay_warning_time = 4h
+
+readme_directory = no
+
+# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
+# fresh installs.
+compatibility_level = 2
+
+
+
+# TLS parameters
+smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
+smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
+smtpd_tls_security_level=may
+
+smtp_tls_CApath=/etc/ssl/certs
+smtp_tls_security_level=may
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
+
+alias_maps = hash:/etc/aliases
+alias_database = hash:/etc/aliases
+
+mailbox_size_limit = 0
+recipient_delimiter = +
+inet_interfaces = all
+inet_protocols = all
+
+myhostname = digital.opensem.com
+mydomain = opensem.com
+mydestination = $myhostname, localhost, digital.opensem.com
+mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.16.0.0/12
+
+maillog_file = /var/log/mail.log

docker/smtp/run.sh

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+#!/bin/bash
+
+# service postfix start
+
+# exec /usr/sbin/postconf maillog_file=/var/log/postfix.log
+# exec /usr/sbin/postfix -c /etc/postfix start-fg
+/etc/init.d/postfix start
+