[Mailman-Users] too many log-files

Every now and then my harddisk gets filled up with about 200000 files in the /var/log/mailman dir. This is too much for linux to handle, so it hang. When I try removing the files with rm *, it reports that there are too many arguments. Obviousley it is quite annoying that this happens and I would very much like to turn the "feature" of. Does anyone know what happens and how I can prevent it? You can find a printout of the fillelist here: http://kolaf.dynu.com/filliste.txt

Frank Olaf