These ebuilds come from http://dev.gentoo.org/~falco/.
If you have some problems, go to the official site first.
postfix : A fast and secure drop-in replacement for sendmail. ( http://www.postfix.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a falco
For Paludis use this rsync : rsync://gentoo.zugaina.org/falco-portage
If you have a problem : ycarus(-at-)zugaina.org