Go to Apps, open Address Ninja, and click Prevent Post Office Boxes from the welcome screen. Click Activate. You can change the message shown when a customer enters a PO Box address.
Originally from our Help Center
How do I prevent post office boxes with Address Ninja?
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How to Require Complete Addresses on Shopify Checkout (Apartment Numbers and PO Boxes)
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Read article →How do I block specific ZIP / postal codes with Address Ninja?
In your Shopify admin, go to Apps and open Address Ninja. Click ZIP / Postal Code Block.
Read article →How do I validate ZIP / postal code formats with Address Ninja?
From your Shopify admin, open Address Ninja and click ZIP / Postal Code Format Validation. Search and add the countries where you want to enforce proper ZIP / postal code formatting.
Read article →Can I allow addresses in regions with unusual formats to bypass validation with Address Ninja?
No. There is no way to bypass validation for specific regions or customers at this time.
Read article →Can I run validation on Phone number with Address Ninja?
Not right now. Phone number validation isn’t available yet, but it’s on our list of requested features.
Read article →