Stop paying expensive carrier return fees for undeliverable addresses.
- Stores using it
- — Not detected yet
- Rating
- 5.0 / 5 2 reviews
- Price
- $10 / mo Free plan available
- Launched
- March 2026 United States
Screenshots
About modlet: Block PO Box & Lockers
Stop paying expensive carrier return fees for undeliverable addresses.
Protect your shipping margins with reliable, global PO Box blocking. Built natively into Shopify Checkout, it physically blocks checkout completion for restricted addresses—ensuring 100% reliability. Why offer a generous free tier? Built by a veteran cloud architect, our highly efficient infrastructure keeps costs low, and we love helping new stores get off the ground. Grow with us for free, and upgrade to Pro as your volume increases or when you need granular, custom shipping rules.
- Block PO Boxes and lockers worldwide to stop failed deliveries.
- Secure checkout blocking that buyers cannot bypass or work around.
- Test your blocking rules safely using the built-in address simulator.
- Pro: Create custom error messages to match your brand and local languages.
- Pro: Set specific exception rules for shipping methods, regions, or products.
modlet: Block PO Box & Lockers pricing
Free plan available · Free trial · From $10 / month. Prices in USD; check the App Store for the latest.
-
Free
Free
- Block PO Boxes globally (Instant setup)
- Up to 250 Store Orders per Month
- Native & Secure Checkout Validation
- Address Simulator & Testing Tool
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Pro
$10 / month
99 billed yearly (save 18%)
- Unlimited Orders & Address Validations
- Custom Error Messages & Translations
- Shipping Method Filtering
- Product Exemptions
- Country & Region Whitelisting
- Granular Pattern Rules
- VIP Customer Tag Exemptions
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Enterprise
$99 / month
999 billed yearly (save 16%)
- White-Glove Setup & Dedicated Onboarding
- On-Demand Custom Data Exports & Reports
- Priority Custom Feature Development
- Dedicated Technical Account Manager
- 1-on-1 Workflow & Strategy Configuration
- Guaranteed Custom SLA & Compliance Help
Shopify stores using modlet: Block PO Box & Lockers
We haven't detected modlet: Block PO Box & Lockers on a live Shopify store yet. We recognise the apps that leave a trace in a store's code; some apps run only in the admin or the checkout.
Detect apps on any storeFAQ
modlet: Block PO Box & Lockers: FAQ
Stop paying expensive carrier return fees for undeliverable addresses.
modlet: Block PO Box & Lockers has a free plan; paid plans start at $10 a month.
We haven't detected modlet: Block PO Box & Lockers on a live Shopify store yet. Scan any store on ShopScan to see the apps it runs.
modlet: Block PO Box & Lockers is built by modlet, based in United States, and launched in March 2026.
5.0 out of 5 from 2 reviews on the Shopify App Store.