2012-03-27 Phil pointed me to the OpenBSD spamd. [0] [1] [2] As I am deeply dissatisfied with SpamAssassin, the description of the OpenBSD spamd sounds promising. Unfortunately it uses pf, which I don't have on GNU/Linux. Don't know if it's possible to get it working though. Currently, I can't go for that because I need to work on mmh. [0] http://www.openbsd.org/spamd/ [1] https://en.wikipedia.org/wiki/Spamd [2] http://www.ualberta.ca/~beck/nycbug06/spamd/index.html http://marmaro.de/lue/ markus schnalke