I've had one in a week, and not from sysprem. That's an acceptable level as far as I'm concerned. Hopefully sysprem is gone forever. Not sure why this happened - but if it's an individual that makes money from bombarding people with referrals, hopefully sysprem is being dealt with by authorities.
Anyway, a big thank-you to everyone involved, including everyone here.
Like with old sysprem, no filters worked. So far blacklisting seems to be working (none for a couple of days), but it is only a 'fingers crossed' thing, and I expect more. Presumably sysprem has got out of jail and changed name to asturiex.