For some reasons, I needed to start with a fresh config so I moved away my
/etc/exim4 directory to start with a completely new one. I discovered that
running `dpkg-reconfigure exim4-config` fails if the /etc/exim4 doesn't exist :
# dpkg-reconfigure exim4-config
find: "/etc/exim4": Aucun fichier ou dossier de ce type
find: "/etc/exim4": Aucun fichier ou dossier de ce type
/var/lib/dpkg/info/exim4-config.postinst: 392: cannot create
/etc/exim4/update-exim4.conf.conf: Directory nonexistent
It's not really an issue for me, but I think that could be useful if we could
reconfigure exim4 without an existent /etc/exim4 directory.