Guess what, it’s reported that 80% of spam activities are supported by around 100 known spam operations. As spams can be traced via aliases, addresses, redirects, locations of servers, domains and dns setups, to a hard-core group of around 100 known spam operations, almost all of whom are listed in the ROKSO database.
No wonder spam volumes drop more than 70% when one major web hosts was shut down on Tuesday (Nov 11, 2008).
According to the news, experts say the precipitous drop-off in spam comes from Internet providers unplugging McColo Corp., a hosting provider in Northern California that was the home base for machines responsible for coordinating the sending of roughly 75 percent of all spam each day. Read related story here, here, and here.