Officials announce deadlines for holiday mail delivery Published Oct. 29, 2013 American Forces Press Service WASHINGTON -- Military Postal Service Agency officials recommend that parcel post packages for service members overseas be mailed by Nov. 12 for delivery by the holidays. Officials at MPSA, an extension of the U.S. Postal Service, have published a chart that shows deadlines for various mailing options, broken down by the APO/FPO/DPO numbers of various destinations. USPS is offering a discount on its largest priority mail flat rate box at $14.85. The price includes a $2 per box discount for military mail being sent to APO/FPO/DPO destinations worldwide, officials said. Priority mail flat rate boxes are available free at local post offices, or can be ordered from USPS online. Postage, labels and customs forms also are available online. Related sites: Mailing Deadlines Chart U.S. Postal Service USPS Guidelines for Packing, Addressing and Shipping Items to Troops