Earlier this week, readers reacted with skepticism after Berkeley City Councilman Gordon Wozniak suggested that taxing email might be one way to raise money for the cash-strapped U.S. Postal Service. … But there’s a history to this idea, however outlandish as it might sound to some. The United Nations Development Program examined such a tax in its 1999 Human Development Report, Globalization With a Human Face, as a way to fund “the global communications revolution.” UNDP calculated that in 1996, such a tax would have raised $70 billion globally. The New York Times took a brief look at the concept...