His career included work at Microsoft, Apple and a founding role with Mailblocks Phil Goldman, the founder and chief executive officer of Mailblocks Inc. and one of the founders of WebTV Networks Inc., has died at age 39, according to a statement released by the company on Sunday.Goldman, who also worked at Microsoft Corp., Apple Computer Corp. and General Magic Inc. during his 20-year IT industry career, founded Mailblocks in 2002. The Los Altos, California, company sells a challenge/response e-mail service that consumers can use to filter out unwanted e-mail messages.Mailblocks was founded five years after WebTV was acquired by Microsoft for $425 million. WebTV sold a television-based e-mail and Web browsing service that was renamed MSN TV after the 1997 purchase. Mailblocks will continue operations under a three-member executive management team led by Vice President of Sales and Marketing Susan Bratton, Vice President of Engineering Rich Landsman and Vice President of Network Operations Phil Steffora.Goldman died on the night of Dec. 25, a company spokeswoman said in an e-mail message to IDG News Service. The cause of death has not yet been determined, she said.A graduate of Princeton University’s School of Engineering, Goldman was the holder of 19 U.S. patents, the statement said. Software DevelopmentTechnology IndustrySmall and Medium Business