anchor.diff:  ADD dovecot/dovecot-sql.conf.ext /etc/dovecot/dovecot-sql.conf.ext
   ADD dovecot/conf.d/10-auth.conf /etc/dovecot/conf.d/10-auth.conf
   ADD dovecot/conf.d/10-logging.conf /etc/dovecot/conf.d/10-logging.conf
  -ADD dovecot/conf.d/10-mail.conf /etc/dovecot/conf.d/10-mail.conf 
  +ADD dovecot/conf.d/10-mail.conf /etc/dovecot/conf.d/10-mail.conf
   ADD dovecot/conf.d/10-master.conf /etc/dovecot/conf.d/10-master.conf
   RUN chown -R vmail:dovecot /etc/dovecot
   RUN chmod -R o-rwx /etc/dovecot
  
positive.code: RUN echo "postfix postfix/mailbox_limit   string  0" | debconf-set-selections
  RUN echo "postfix postfix/relayhost       string" | debconf-set-selections
  # Install postfix
  RUN apt-get install -y postfix postfix-mysql 
  # Stop postfix
  RUN service postfix stop
  
  
negative.code: # Prepare Nginx
  RUN rm /etc/nginx/sites-enabled/default
  ADD nginx/vimbadmin /etc/nginx/sites-available/vimbadmin
  RUN ln -sf /etc/nginx/sites-available/vimbadmin /etc/nginx/sites-enabled/vimbadmin
  RUN mkdir /var/www
  ADD nginx/correct-vimbadmin-hostname.sh /tmp/correct-vimbadmin-hostname.sh
  RUN /bin/sh /tmp/correct-vimbadmin-hostname.sh
  