HOUSTON—Jim Funderburke, a 240-pound accountant, was surprised to find a photo of himself in a spam e-mail for a weight-loss product Monday. "That's the last time I post vacation pictures on my web site," said Funderburke, 38, gazing at an unflattering image of himself in a bathing suit. "I'd like to be able to check my messages without seeing myself used as the online embodiment of obesity and overindulgence." Funderburke also expressed a wish to water his lawn without neighborhood teenagers calling him "Before Dude."