The U.S. Postal Service is ready to help family and friends separated by distance this Easter season. Gifts can be sent as late as Saturday, March 22, for delivery on Easter Sunday by the Postal Service, the only shipping service that delivers on Sundays.  Express Mail, the Postal Service’s premier package service, provides overnight delivery to most destinations nationwide at prices lower than other carriers provide and includes a money-back guarantee, tracking, proof of delivery, and insurance, all at no additional cost.