mailcatcher : Runs an SMTP server, catches and displays email in a web interface. ( http://mailcatcher.me/ )
opensmtpd : Lightweight but featured SMTP daemon from OpenBSD ( http://www.opensmtpd.org/ )
opensmtpd-extras : Official addons for OpenSMTPD ( http://www.opensmtpd.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a cvut
For Paludis use this rsync : rsync://gentoo.zugaina.org/cvut-portage
If you have a problem : ycarus(-at-)zugaina.org