Antispam company Postini Inc. said that it is now rejecting more than half of all attempts to send e-mail to its customers, due in part to increased activity from compromised home computers that have been turned into "zombies" for sending unsolicited commercial ("spam") e-mail. The company is dropping 53 percent of all e-mail connections that use the SMTP (Simple Mail Transfer Protocol) without reading the content of the e-mail messages. That's an almost 20 percent increase since the company began aggregating information about troublesome Internet addresses from across its customer base, said Andrew Lochart, director of product marketing at Postini. more