/etc/init.d/postfix
/etc/insserv.conf.d/postfix
/etc/network/if-down.d/postfix
/etc/network/if-up.d/postfix
/etc/postfix/main.cf.proto
/etc/postfix/master.cf.proto
/etc/postfix/postfix-files
/etc/ppp/ip-down.d/postfix
/etc/ppp/ip-up.d/postfix
/etc/resolvconf/update-libc.d/postfix
/etc/rsyslog.d/postfix.conf
/etc/ufw/applications.d/postfix
remove-on-upgrade /etc/postfix/postfix-script
remove-on-upgrade /etc/postfix/post-install
remove-on-upgrade /etc/network/ip-down.d/postfix