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USPS to Enforce Stricter Requirements on Military Mail in March

The United States Postal Service will begin enforcing stricter customs data requirements for mail sent to or from overseas military and diplomatic post offices on March 16, 2026. Any shipment containing a good, weighing 16 ounces or more, or sent as Priority Mail Express must include a computer‑generated customs declaration transmitted electronically. Non‑compliant items will be returned to the sender’s address. Sellers are urged to update their shipping workflows to meet the new standards before the enforcement date.