Mighty PO Box Blocker

Mighty PO Box Blocker

by PO Box Blocker

Warn customers against entering in PO Box addresses.

5.0 of 5 stars(5 reviews)

Block PO Boxes

Block PO Box addresses that FedEx, UPS and DHL do not deliver to.

Mobile Friendly

Optimized for both desktop and mobile devices.

Save time

Saves you time and money so you can focus on your business.

About Mighty PO Box Blocker

Say goodbye PO Box issues!

Do you primarily ship with FedEx, UPS or DHL?

If so, PO Box Blocker is an amazing solution for you! This app warns customers against using PO Box addresses, saving you time and money.

How does it work?

Whenever a PO Box address is detected, a warning is displayed on the cart view and/or the shipping method step of checkout. The warning informs customers that your store does not ship to PO Box addresses and instructs them to specify a valid residential or commercial address instead. You can fully customize the warning messages via the dashboard.

Future Features

  1. Email notifications to the merchant and/or customer


Because this app utilizes Shopify's carrier service feature for the warning during checkout, you must meet one of the following requirements to enable the feature:

  • Advanced Shopify plan or higher
  • Shopify plan is paid annually
  • Development store

If none of the requirements are met, you can contact Shopify Support to enable the carrier calculated shipping feature for $20/month - this fee is waived if you opt for annual billing.

Constant improvement

We are always adding new features and enhancements based feedback from merchants. Please reach out to us if you have any suggestions!

Media gallery


Pricing 7-day free trial


* All charges are billed in USD. Recurring charges, including monthly or usage-based charges, are billed every 30 days.

5.0 of 5 stars

The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
  • 5 of 5 stars
    100% of ratings are 5 stars
  • 4 of 5 stars
    0% of ratings are 4 stars
  • 3 of 5 stars
    0% of ratings are 3 stars
  • 2 of 5 stars
    0% of ratings are 2 stars
  • 1 of 5 stars
    0% of ratings are 1 stars

Most recent reviews


It is a great app and I love it, It saved me more than 1000 USD in shipping to PO BOXES.
Some customers still placing orders with the PO BOX warning so it would be great if the app has a feature to send the mail notifications for these orders.
We can cancel those orders and ask customers to provide physical addresses.

Par en Par

This app is super simple and easy to install and control. Love the page with 3 simple options to toggle on/off at any time!

Developer reply

October 12, 2020

We are glad that you like our new dashboard. Thanks for the review!

Stuff For Your Dog

If you're looking for a no-code way to warn your customers that you cannot ship/fulfill orders to PO Boxes, this app takes care of displaying a warning when entering the checkout and if you meet certain criteria, can also provide guidance to your customers during checkout as well, all without having to edit your theme or otherwise modify/edit any code.

Developer reply

October 12, 2020

Thanks for the review!