While free Web services produced just 6% of the Internet's pill-hawking and scam-pitching e-mail a year ago, automated spam programs exploiting Web e-mail services now produce more than 12% of digital junk mail, with Microsoft's Webmail services alone accounting for around 4%.

FORBES: Magazine Article

Another shadow site, which was reportedly hosted by the Tripod internet service provider in the US, has been taken down after attempting an e-mail scam.

BBC: eBay shadow site