PO Box Blocker — AddressFence: Free blocks shipping PO Boxes and parcel lockers (demo)
Free blocks PO Boxes and parcel lockers on the shipping address at checkout, plus a small set of ZIP rules. Street-number checks and billing-address rules are on a paid plan. This screencast shows configuring those rules and testing addresses in the simulator before publishing, with one-click rollback.
This English-captioned demo shows how to open the embedded app and configure rules. Billing-address rules and the street-number check are on a paid plan. Test any address in the simulator before publishing, with one-click rollback.
Install PO Box Blocker — AddressFence
The current explanation of native shipping-rate hide versus checkout validation versus this path is Block PO boxes: native shipping-rate hide vs checkout validation vs AddressFence.
Which public listings mention billing or a street-number check: PO box blocker apps: which ones check the billing address.
After Address Blocker sunset on 31 August 2026, see Require a street number after the Address Blocker sunset.
The standalone street-number checkout guide is Require a street number at Shopify checkout after the Address Blocker sunset.