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modlet: Block PO Box & Lockers
by modlet
Stop costly carrier return fees with unlimited, free PO Box blocking. Prevent undeliverable addresses instantly. Upgrade for custom routing and exemptions.
5.00(1 reviews)· Free plan available. Free trial available.· Launched Mar 9, 2026
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Stop costly carrier return fees with unlimited, free PO Box blocking. Prevent undeliverable addresses instantly. Upgrade for custom routing and exemptions.
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Data last refreshed Jun 19, 2026. Source: Shopify App Store.