In cities such as San Francisco and New York, letter carriers have been showing up on people's doorsteps as early as 3 a.m. bearing unusual cargo: milk, eggs, and other perishable items. The U.S. Postal Service has been delivering groceries to customers of Amazon.com in selected areas since October 2014. "It's just leveraging our infrastructure," says Megan Brennan, who was sworn in as America's 74th postmaster general in March, becoming the first woman to hold the job in the institution's 240-year history. "We're on people's doorstep six days a week, seven days a week in some cases. It's just a logical progression." A former letter carrier from Pottsville, Pa., Brennan is trying to transform the USPS into a delivery service for the e-commerce era. That means hauling fewer letters and more packages. It means showing up with them at once-unheard-of hours and even on Sundays. "Amazon is the first," Brennan says. "But we're obviously looking to get additional customers who are interested in that type of customized delivery."
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