Gentoo + qmail-scanner + spamassassin

Installing qmail-scanner with spamassassin and other helpers (such as razor2, dcc) is not that difficult, but several docs on Gentoo site, such as this good & popular & bloated topic are outdated. One thing that caused me quite a bit of pain is that qmail-scanner not detecting spamassassin. This topic helps solve the issue. Qmail-scanner ebuild uses ST patch, which is located here. I found some nice articles comparing various network tests using in spamassassin in spamassassin book. Last comment is to install mail-filter/spamassassin-ruledujour from the ebuild too.