http://www.internetnews.com/stats/article.php/3292351
Key line for us MX admins: "Of the 23.5 million high-speed lines now in service, 20.6 million served residential and small business subscribers,..." ... but no breakdown on residential (automatically blockable) vs business (plausibly legit). Assume 1% of total is business lines: 206K businesses vs 20.8M residential. And assume the qty of msgs per IP sent from residential RATware-infected and willful residential spammers is vastly greater than legit msgs from business mail servers. And that's just the USA. 12-month increases in installation running 20% to 45%. The global picture: http://www.internetnews.com/stats/article.php/329235 Len
