While installing a fresh new machine by following the handbook, the suggested installation of vixie-cron doesn't succeed. The system needs the package ssmtp_2.60.9.tar.gz that is not found in any place (try google!).
http://mirror.gentoo.sk/pub/distfiles/ssmtp_2.60.9.tar.gz I'm sure it's on any Gentoo mirror.
Yes, now it's availablle. When I posted this "bug" there was no reference to this packages either in the mirrors from the mirror list or even in the internet. This is why I said "try google".