dedibox1:~# dpkg -L postfix
/etc
/etc/init.d
/etc/init.d/postfix
/etc/ppp
/etc/ppp/ip-up.d
/etc/ppp/ip-up.d/postfix
/etc/ppp/ip-down.d
/etc/ppp/ip-down.d/postfix
/etc/network
/etc/network/if-up.d
/etc/network/if-up.d/postfix
/etc/network/if-down.d
/etc/network/if-down.d/postfix
/etc/postfix
/etc/postfix/postfix-script
/etc/postfix/post-install
/etc/postfix/postfix-files
/etc/resolvconf
/etc/resolvconf/update-libc.d
/etc/resolvconf/update-libc.d/postfix
/var/spool/postfix
/var/spool/postfix/usr
/var/spool/postfix/usr/lib
/var/spool/postfix/usr/lib/zoneinfo
dedibox1:~#