I am accustomed to receiving e-mail from Amazon.com, as I am a fiercely loyal customer who shops there quite frequently. But it took me by surprise this weekend to discover that that mounds of porn spam and junk e-mail laced with computer viruses are actively being blasted from digital real estate leased to the e-commerce giant. I wasn’t the only one who spotted it. Websense Security Labs issued an alert about the spam attacks on Monday, but it didn’t name Amazon as the source. The advisory rightly noted that it had discovered “a substantial number of spam messages utilizing a reliable social engineering trick.” The junk mail claims to have been sent from Microsoft, and urges the recipient to install an attached security update. Windows users who fall for the ruse will have their systems infected with a backdoor Trojan horse program that gives the attackers easy access with which