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modlet: Block PO Box & Lockers

Develop by modlet

$10.99

/ Month
Free plan available

Instantly block undeliverable addresses at checkout for seamless shipping.

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About modlet: Block PO Box & Lockers

Launched Mar 09, 2026

Categories

Checkout - Other

Built by modlet

Address

4370 Chicago Drive SW, Unit #744, Grandville, MI, 49418, US

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Description

Prevent failed deliveries and carrier return fees by blocking PO Boxes at checkout.

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.

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. more
  • 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.

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