Four months after ISPs disconnected hosting provider McColo, the global
volume of junk e-mail has apparently returned to its previous levels,
Google stated in an analysis posted on Tuesday.
Using data collected from its filtering of spam on behalf of 15 million business users, the search giant found
that, by the latter half of March, the seven-day average level of junk
e-mail climbed to pre-McColo levels. In addition, the first quarter of
2009 had a higher spam growth rate, about 1.2 percent per day, than the
average daily rate in 2008. The jump in junk e-mail comes after the November takedown of McColo, which had hosted the command-and-control servers used by spammers to control their botnets.