As spam levels increased quite a bit lately, I made a Gentoo Ebuild for the iXhash SpamAssassin plugin by Bert Ungerer / Heise iX, Germany.
So far, it’s available on bugs.gentoo.org only. In order to install it, download
and put it in your local Portage Overlay.
YMMV, but it performs really well on my server (particularly for German spam which is difficult to catch without). Don’t forget to adjust the according penalty scores to your liking, though!
Finally, I’ve had to enable greylisting for this domain due to ever increasing levels of spam. Fortunately, setting it up is very easy. For Gentoo and Postfix, here’s a nice walkthrough:
postfix greylisting on gentoo (postgrey) | andreas d.’s.
Let’s hope that this, in conjunction with other anti-spam measures, will do it for a while.
Non-spammers shouldn’t experience any problems due to this change, but if you do, please contact me using Skype (mettlerd), phone or SMS.