By Elvina Nawaguna WASHINGTON (Reuters) – The U.S. Postal Service, bleeding millions of dollars daily, is hoping the 2013 holiday season will boost its finances through a partnership with Amazon.com, a surge in online shopping and the timely release of a new stamp featuring a whimsical Yule gingerbread house. The holiday shopping and card- and gift-sending season usually is a busy time for the USPS, which expects a 12 percent jump in package volumes to 420 million this year from last years holiday season, it said. Yet the potentially lucrative deal with online shopping giant Amazon to deliver packages on Sundays positions USPS to compete more favorably in the $186-billion annual e-commerce market. Parcel delivery is the part of the business that the Postal Service needs to rely on to become sustainable, said Rick Geddes of Cornell University who has written about USPS.