PO Box Blocker Pro

Update - July 2026 Hi there, Thank you again for sharing this feedback. Since your review, PO Box Blocker Pro has been completely rebuilt using Shopify’s latest server-side checkout validation system. The app now blocks PO Box addresses across all Shopify plans, including standard checkout and Shop Pay. Your feedback helped us identify an important gap and directly influenced this major upgrade. We’d be happy to help you test the updated version should you decide to try it again. Thank you for helping us improve PO Box Blocker Pro.