DMM Advisory: 2011 Holiday Shipping Dates for APOs/FPOs/DPOs. With the holiday season fast approaching, we are reminding friends and families to mail early to ensure delivery of their holiday cards and packages to APO/FPO/DPO destination addresses by December 25. Deadlines for mailing to specific APO/FPO/DPO ZIP Codes vary according to the specific classes of mail being sent to them. They are listed below. We also remind mailers that all mail addressed to overseas military/diplomatic Post Offices is subject to certain conditions or restrictions regarding content, preparation and handling. Those restrictions are listed by individual APO/FPO/DPO ZIP Code in each Postal Bulletin. To access this listing on the Internet, go to pe.usps.com, click Postal Bulletins in the blue navigation bar, and then select the Pull-Out Information section.