Domains hosted on these ns-joker nameservers
a.ns.joker.com
b.ns.joker.com
c.ns.joker.com
are involved in SPAM: http://www.joewein.de/sw/ns-joker-com.htm
10 red out of 10: http://toolbar.netcraft.com/site_report?url=http://217.19.237.54

pol