modlet: Block PO Box & Lockers
- Pricing
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Free plan available. Free trial available.
- Rating
- 0.0 (0 Reviews)
- Developer
- modlet
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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.
Languages
English
Works with
Categories
Pricing
Free
Free
Features
- Block PO Boxes globally (Instant setup)
- Up to 250 Store Orders per Month
- Native & Secure Checkout Validation
- Address Simulator & Testing Tool
Pro
$10.99 / month
or $99.99/year and save 24%
Features
- Unlimited Orders & Address Validations
- Custom Error Messages & Translations
- Shipping Method Filtering
- Product Exemptions
- Country & Region Whitelisting
- Granular Pattern Rules
- VIP Customer Tag Exemptions
14-day free trial
Enterprise
$99.99 / month
or $999.99/year and save 17%
Features
- 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
30-day free trial
All charges are billed in USD. Recurring and usage-based charges are billed every 30 days.
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Support
App support provided by modlet.
Resources
Launched
March 9, 2026
Data access
This app needs access to the following data to work on your store. Learn why in the developer's privacy policy .
View personal data:
Customers, store owner
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Customers
Name, email address, phone number, physical address, geolocation, IP address, browser and operating system
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Store owner
Name, email address, phone number, physical address
View and edit store data:
Products, orders, Shopify Functions, Online Store
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Edit products
Products, collections
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View orders
Shipping information
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Edit Shopify Functions
Delivery customizations, cart and checkout validations, cart transforms
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Edit Online Store
Metaobjects
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View other data
Shopify Markets settings
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