fixed postfixadmin smtp server

env

 DOVECOT_SASL_PORT=12345
 DOVECOT_LMTP_PORT=24
 
+POSTFIX_HOST=postfix.mx.internal.docker
+
 OPENDKIM_HOST=opendkim.mx.internal.docker
 OPENDKIM_PORT=12345

postfixadmin/Dockerfile

 # FROM https://github.com/ZHAJOR/Docker-Apache-2.4-Php-5.6-for-Laravel
 MAINTAINER Robin Thoni <robin@rthoni.com>
 
-COPY run.sh /run.sh
-
 RUN apt-get update && apt-get -y install\
         apache2=2.4.*\
         libapache2-mod-php5\
         rm -rf /var/www/html &&\
         mkdir -p /var/lock/apache2 /var/run/apache2 /var/log/apache2 /var/www/html &&\
         chown -R www-data:www-data /var/lock/apache2 /var/run/apache2 /var/log/apache2 /var/www/html &&\
-        chmod -v +x /run.sh &&\
         ln -sf /dev/stderr /var/log/apache2/error.log &&\
         ln -sf /dev/stdout /var/log/apache2/access.log
 
 COPY apache2.conf /etc/apache2/apache2.conf
 
-EXPOSE 80
 
 COPY ./postfixadmin-3.0/ /var/www/html/
 RUN chmod -R 777 /var/www/html/templates_c
 
+COPY run.sh /run.sh
+
+EXPOSE 80
+
 CMD ["/run.sh"]

postfixadmin/postfixadmin-3.0/config.inc.php

 // Mail Server
 // Hostname (FQDN) of your mail server.
 // This is used to send email to Postfix in order to create mailboxes.
-$CONF['smtp_server'] = 'localhost';
+$CONF['smtp_server'] = 'POSTFIX_HOST';
 $CONF['smtp_port'] = '25';
 
 // SMTP Client

postfixadmin/run.sh

 #!/bin/bash
 
+sed -e "s/POSTFIX_HOST/${POSTFIX_HOST}/" -i /var/www/html/config.inc.php
+
 rm -f /run/apache2/apache2.pid
 exec /usr/sbin/apache2ctl -D FOREGROUND