anchor.diff:  # 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 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
  
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: 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-master.conf /etc/dovecot/conf.d/10-master.conf
  RUN chown -R vmail:dovecot /etc/dovecot
  RUN chmod -R o-rwx /etc/dovecot
  