PO Box Blocker Pro automatically detects and blocks PO Box addresses during checkout, helping merchants avoid failed deliveries, shipping delays, and costly fulfillment errors. The app is easy to set up and ensures customers provide a valid street address, improving shipping reliability and reducing manual address verification work for store owners.

• Detects and blocks PO Box addresses at checkout (Shopify Plus only).
• Allows merchants to exempt specific products from PO Box blocking.
• Customize the message shown when customers enter a PO Box address.
• Works seamlessly with Shopify Checkout and doesn’t require any theme edits.
• Toggle PO Box blocking on or off at any time with a single click.