Seems that the attacks on the solsys.org domain are increasing heavily, even the spam-engine is getting higher hit rates as ever before.
Looking around on the net - I found out there are some sites putting together lists of IP addresses that identify probable drone/Zombie-networks, also all network RIPE Blocks that are not clearly assigned or were the Addresses of the holders are wrong - do exist. Beeing a friend of automation - I adapted my isc-blacklist script to actually include these new lists.
The entire adaptation of my scripts took roughly 10minutes, however, the static blacklist increased to ~200 entries. Hopefully this will lead to lower spam-bot network hits onto the mail-system - as the blacklist blocks the entire traffic from these networks