Postfix-LDAPS bug : https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/81242/comments/13

apt-get --no-install-recommends install sympa libmime-types-perl libxml-sax-expat-perl doc-base

http://help.lockergnome.com/linux/Bug-587154-Sympa-upgrade-overwrites-current-conf-files--ftopict537998.html

https://sourcesup.cru.fr/tracker/index.php?func=detail&aid=7922&group_id=23&atid=167