After ranting against Akismet some days ago, and receiving many suggestions about how to solve the problem, I got the spam under control (at least I hope so…). The trick was to use the standard option in Wordpress to blacklist some words. So I drew up a short list of words that kept popping up in the spam comments and, voila, suddenly I have clean comments again. Thanks to everybody suggesting how to get rid of the spam, I might write a small post in the future about all these solutions as there are quite a few interesting among them