From December 22 through December 25, Postal Service™ customers choosing Express Mail® Next Day service will be provided with adjusted refund eligibility information. Express Mail items accepted on these days will be eligible for a postage refund only in instances where delivery or attempted delivery is not made within 2 delivery days after the mailing date.
Providing accurate communications to the thousands of customers arriving at Post Offices™ during the holiday week is critical. Retail associates will follow a special Express Mail Acceptance SOP, which includes marking the origin section of the label with the word “Holiday.”
During the week of Christmas, unexpected heavy volumes and unpredictable weather issues occasionally result in challenges to the ability to transport all Express Mail items for timely overnight delivery. The refund adjustment continues to provide customers with a money-back guarantee, while modifying expectations in the event overnight service in any particular area of the country becomes unachievable.
Service commitments and performance measurements will not change. Delivery employees will continue to deliver Express Mail items the day they arrive at delivery units, regardless of the markings on the label.
— Expedited Operations, Expedited Shipping, 12-17-09