FedEx is back delivering packages for Amazon six years after it publicly severed ties. Amazon announced that FedEx and several other carriers, including the U.S. Post Office, have signed contracts to deliver packages to residential customers, the last-mile delivery that is the most expensive for carriers.

Amazon has hired FedEx to handle some of its large package deliveries, the companies said on Monday, weeks after UPS said it was halting its less-profitable deliveries for the e-commerce retailer and cutting 20,