Thousands of pieces of spam were stopped in its tracks on Tuesday when a hosting site known for relaying spam was shut down. Reports indicate that all spam was reduced by as much as 50% within one day of the site's demise.
San Jose, Calif.-based hosting site, McColo, was shut off by the site's upstream provider. McColo is believed to be responsible for up to 75% of all spam email. Upstream provider Hurricane Electric shut off service to McColo at 9:00 a.m. on Tuesday.
It is speculated that spammers may now regroup in Eastern Europe according to Adam O'Donnell, who posted on the ZDNet Zero Day blog. A similar shutdown occurred in September when Intercage/Ativo was nixed by its upstream providers.