Currently, the best way is using this app called Ultimate PO Box Blocker. It stops customers from punching in PO Box addresses at checkout, letting them know that shipping to that address is unavailable. It’s a simple 1-click install with no rules to set up.
Topic summary
Issue: A new Shopify merchant using Fine Art America needs to prevent checkout with PO Box addresses and display a clear “No PO Boxes” notice. They also ask how to preview the change without placing an order.
Suggested approaches:
- Edit checkout text: Settings > Checkout > Manage Checkout Language. Add “No PO Boxes” to shipping address labels. This only warns; it doesn’t block.
- Use apps to block at checkout:
• King Checkout Validation: detects PO Boxes and shows an error to stop submission (screenshot provided).
• Ultimate PO Box Blocker: described as a one‑click install that prevents PO Box entries and informs customers. - Policy/process: Flag PO Box addresses and contact customers to obtain a physical address before fulfillment.
Status and gaps:
- No native Shopify setting to hard-block PO Boxes was provided; solutions rely on language edits or apps.
- The request for how to preview checkout changes without making a purchase was not answered.
- No confirmation of which solution the merchant adopted; discussion remains open.