Shipping carriers like UPS and FedEx cannot deliver to PO Boxes, leading to expensive return fees and frustrated customers. This app runs natively on Shopify Functions to instantly block undeliverable addresses at checkout. Our app uses advanced pattern detection to catch worldwide variations of PO Boxes, Lockers, and Military Addresses. Whether you are optimizing your standard fulfillment or enforcing strict shipping rules for regulated goods, our basic tier gets you started in seconds.

• Block PO Boxes, Lockers, and Military Addresses to prevent failed deliveries.
• Stop expensive UPS/FedEx carrier return fees instantly.
• Native Shopify Checkout integration—unhackable with zero theme code.
• Exempt specific countries or shipping methods from blocking rules.
• Perfect for general logistics or strictly regulated shipping requirements.