diff --git a/docs/README.md b/docs/README.md
index d8def18a..509f6135 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -131,6 +131,7 @@ This directory is built automatically. Each task's documentation is generated fr
 * [Auto-tag orders when paid](./auto-tag-orders-when-paid)
 * [Auto-tag orders with UTM parameters](./auto-tag-orders-with-utm-parameters)
 * [Auto-tag orders with a cart attribute](./auto-tag-orders-with-a-cart-attribute)
+* [Auto-tag orders with a post office box](./auto-tag-orders-with-a-post-office-box)
 * [Auto-tag orders with chargeback or inquiry activity](./auto-tag-orders-with-chargeback-or-inquiry-activity)
 * [Auto-tag orders with customer tags when new customer tags are added](./tag-orders-with-customer-tags-when-customer-is-tagged)
 * [Auto-tag orders with mismatching billing and shipping addresses](./auto-tag-orders-with-mismatching-billing-and-shipping-addresses)
@@ -379,6 +380,7 @@ This directory is built automatically. Each task's documentation is generated fr
 
 ### Address
 
+* [Auto-tag orders with a post office box](./auto-tag-orders-with-a-post-office-box)
 * [Auto-tag orders with mismatching billing and shipping addresses](./auto-tag-orders-with-mismatching-billing-and-shipping-addresses)
 * [Email vendors when an order shipping address changes](./email-vendors-when-an-order-shipping-address-changes)
 * [Update empty customer data from addresses](./update-empty-customer-data-from-addresses)
@@ -495,6 +497,7 @@ This directory is built automatically. Each task's documentation is generated fr
 * [Auto-tag orders when paid](./auto-tag-orders-when-paid)
 * [Auto-tag orders with UTM parameters](./auto-tag-orders-with-utm-parameters)
 * [Auto-tag orders with a cart attribute](./auto-tag-orders-with-a-cart-attribute)
+* [Auto-tag orders with a post office box](./auto-tag-orders-with-a-post-office-box)
 * [Auto-tag orders with chargeback or inquiry activity](./auto-tag-orders-with-chargeback-or-inquiry-activity)
 * [Auto-tag orders with customer tags when new customer tags are added](./tag-orders-with-customer-tags-when-customer-is-tagged)
 * [Auto-tag orders with mismatching billing and shipping addresses](./auto-tag-orders-with-mismatching-billing-and-shipping-addresses)
@@ -1244,6 +1247,7 @@ This directory is built automatically. Each task's documentation is generated fr
 * [Auto-tag orders when paid](./auto-tag-orders-when-paid)
 * [Auto-tag orders with UTM parameters](./auto-tag-orders-with-utm-parameters)
 * [Auto-tag orders with a cart attribute](./auto-tag-orders-with-a-cart-attribute)
+* [Auto-tag orders with a post office box](./auto-tag-orders-with-a-post-office-box)
 * [Auto-tag orders with chargeback or inquiry activity](./auto-tag-orders-with-chargeback-or-inquiry-activity)
 * [Auto-tag orders with customer tags when new customer tags are added](./tag-orders-with-customer-tags-when-customer-is-tagged)
 * [Auto-tag orders with product vendors](./auto-tag-orders-with-product-vendors)
@@ -1608,6 +1612,7 @@ This directory is built automatically. Each task's documentation is generated fr
 * [Auto-tag orders by shipping address city](./auto-tag-orders-by-shipping-address-city)
 * [Auto-tag orders by shipping address country](./auto-tag-orders-by-shipping-address-country)
 * [Auto-tag orders that are ready to ship](./auto-tag-orders-that-are-ready-to-ship)
+* [Auto-tag orders with a post office box](./auto-tag-orders-with-a-post-office-box)
 * [Auto-tag orders with mismatching billing and shipping addresses](./auto-tag-orders-with-mismatching-billing-and-shipping-addresses)
 * [Auto-tag orders with their tracking numbers](./auto-tag-orders-with-their-tracking-numbers)
 * [Email the customer when tracking numbers are added to their order](./email-the-customer-when-tracking-numbers-are-added-to-their-order)
diff --git a/docs/auto-tag-orders-with-a-post-office-box/README.md b/docs/auto-tag-orders-with-a-post-office-box/README.md
new file mode 100644
index 00000000..6a0aee45
--- /dev/null
+++ b/docs/auto-tag-orders-with-a-post-office-box/README.md
@@ -0,0 +1,47 @@
+# Auto-tag orders with a post office box
+
+Tags: Address, Auto-Tag, Orders, Shipping
+
+This task monitors for newly-created orders, and auto-tags any that have a detected post office box in the shipping address. This is useful for shipping services that do not service postal boxes. The task can also optionally send an email notification when a P.O. Box is detected.
+
+* View in the task library: [tasks.mechanic.dev/auto-tag-orders-with-a-post-office-box](https://tasks.mechanic.dev/auto-tag-orders-with-a-post-office-box)
+* Task JSON, for direct import: [task.json](../../tasks/auto-tag-orders-with-a-post-office-box.json)
+* Preview task code: [script.liquid](./script.liquid)
+
+## Default options
+
+```json
+{
+  "tag_to_add__required": "PO-Box",
+  "send_email_notification__boolean": false,
+  "email_recipient__email": "",
+  "email_subject": "P.O. Box Detected - Order {{ order.name }}",
+  "email_body__multiline": "Order {{ order.name }} was flagged as having a P.O. Box in the shipping address:\n\nName: {{ order.shipping_address.first_name }} {{ order.shipping_address.last_name }}\nCompany: {{ order.shipping_address.company }}\nPhone: {{ order.shipping_address.phone }}\n\nShipping Address:\n{{ order.shipping_address.address1 }}\n{{ order.shipping_address.address2 }}\n{{ order.shipping_address.city }}, {{ order.shipping_address.province_code }} {{ order.shipping_address.zip }}\n{{ order.shipping_address.country }}\n\n\nThanks,\n{{ shop.name }}"
+}
+```
+
+[Learn about task options in Mechanic](https://learn.mechanic.dev/core/tasks/options)
+
+## Subscriptions
+
+```liquid
+shopify/orders/create
+```
+
+[Learn about event subscriptions in Mechanic](https://learn.mechanic.dev/core/tasks/subscriptions)
+
+## Documentation
+
+This task monitors for newly-created orders, and auto-tags any that have a detected post office box in the shipping address. This is useful for shipping services that do not service postal boxes. The task can also optionally send an email notification when a P.O. Box is detected.
+
+## Installing this task
+
+Find this task [in the library at tasks.mechanic.dev](https://tasks.mechanic.dev/auto-tag-orders-with-a-post-office-box), and use the "Try this task" button. Or, import [this task's JSON export](../../tasks/auto-tag-orders-with-a-post-office-box.json) – see [Importing and exporting tasks](https://learn.mechanic.dev/core/tasks/import-and-export) to learn how imports work.
+
+## Contributions
+
+Found a bug? Got an improvement to add? Start here: [../../CONTRIBUTING.md](../../CONTRIBUTING.md).
+
+## Task requests
+
+Submit your [task requests](https://mechanic.canny.io/task-requests) for consideration by the Mechanic community, and they may be chosen for development and inclusion in the [task library](https://tasks.mechanic.dev/)!
diff --git a/docs/auto-tag-orders-with-a-post-office-box/script.liquid b/docs/auto-tag-orders-with-a-post-office-box/script.liquid
new file mode 100644
index 00000000..6b85cbbf
--- /dev/null
+++ b/docs/auto-tag-orders-with-a-post-office-box/script.liquid
@@ -0,0 +1,89 @@
+{% assign tag_to_add = options.tag_to_add__required %}
+{% assign send_email_notification = options.send_email_notification__boolean %}
+{% assign email_recipient = options.email_recipient__email %}
+{% assign email_subject = options.email_subject %}
+{% assign email_body = options.email_body__multiline %}
+
+{% comment %} 
+  Check address lines 1 and 2 for a post office box
+  The matching logic strips out all spaces and special characters,
+  then matches against one of several strings followed by a digit
+{% endcomment %}
+
+{% assign order_has_po_box = false %}
+{% assign po_box_regex = "(POB|POBOX|POSTBOX|POSTALBOX|POSTOFFICEBOX|BOXNUMBER|BOXNO|^BOX)\d+" %}
+
+{% assign po_box_match1
+  = order.shipping_address.address1
+  | scan: "[A-Za-z0-9]+"
+  | join: ""
+  | upcase
+  | match: po_box_regex
+%}
+{% assign po_box_match2
+  = order.shipping_address.address2
+  | scan: "[A-Za-z0-9]+"
+  | join: ""
+  | upcase
+  | match: po_box_regex
+%}
+
+{% if po_box_match1 or po_box_match2 %}
+  {% assign order_has_po_box = true %}
+{% endif %}
+
+{% comment %}
+  IF PO Box is detected, add tag to order
+{% endcomment %}
+{% if order_has_po_box %}
+  {% action "shopify" %}
+    mutation {
+      tagsAdd(
+        id: {{ order.admin_graphql_api_id | json }}
+        tags: {{ tag_to_add | json }}
+      ) {
+        userErrors {
+          field
+          message
+        }
+      }
+    }
+  {% endaction %}
+
+  {% if send_email_notification %}
+
+    {% comment %}
+      Show error if emails are enabled and any of the fields are missing
+    {% endcomment %}
+    {% if email_recipient == blank or email_subject == blank or email_body == blank %}
+      {% assign error_message = "Email Notifications are enabled, please add:" %}
+      {% assign error_topics = array %}
+      {% if email_recipient == blank %}
+        {% assign error_topics = error_topics | push: "- a valid email recipient" %}
+      {% endif %}
+      {% if email_subject == blank %}
+        {% assign error_topics = error_topics | push: "- an email subject" %}
+      {% endif %}
+      {% if email_body == blank %}
+        {% assign error_topics = error_topics | push:  "- an email body" %}
+      {% endif %}
+      {% capture error_message %}
+        {{- error_message }}{{ newline }}
+        {{- error_topics | join: newline }}
+      {%- endcapture %}
+      {% error error_message %}
+    {% endif %}
+
+    {% action "email" %}
+      {
+        "to": {{ email_recipient | json }},
+        "subject": {{ email_subject | json }},
+        "body": {{ email_body | newline_to_br | json }},
+        "reply_to": {{ shop.customer_email | json }},
+        "from_display_name": {{ shop.name | json }}
+      }
+    {% endaction %}
+  {% endif %}
+{% else %}
+  {% log "No PO Box detected" %}
+{% endif %}
diff --git a/tasks/auto-tag-orders-with-a-post-office-box.json b/tasks/auto-tag-orders-with-a-post-office-box.json
new file mode 100644
index 00000000..881f6f21
--- /dev/null
+++ b/tasks/auto-tag-orders-with-a-post-office-box.json
@@ -0,0 +1,62 @@
+{
+  "docs": "This task monitors for newly-created orders, and auto-tags any that have a detected post office box in the shipping address. This is useful for shipping services that do not service postal boxes. The task can also optionally send an email notification when a P.O. Box is detected.",
+  "halt_action_run_sequence_on_error": false,
+  "name": "Auto-tag orders with a post office box",
+  "online_store_javascript": null,
+  "options": {
+    "tag_to_add__required": "PO-Box",
+    "send_email_notification__boolean": false,
+    "email_recipient__email": "",
+    "email_subject": "P.O. Box Detected - Order {{ order.name }}",
+    "email_body__multiline": "Order {{ order.name }} was flagged as having a P.O. Box in the shipping address:\n\nName: {{ order.shipping_address.first_name }} {{ order.shipping_address.last_name }}\nCompany: {{ order.shipping_address.company }}\nPhone: {{ order.shipping_address.phone }}\n\nShipping Address:\n{{ order.shipping_address.address1 }}\n{{ order.shipping_address.address2 }}\n{{ order.shipping_address.city }}, {{ order.shipping_address.province_code }} {{ order.shipping_address.zip }}\n{{ order.shipping_address.country }}\n\n\nThanks,\n{{ shop.name }}"
+  },
+  "perform_action_runs_in_sequence": false,
+  "preview_event_definitions": [
+    {
+      "description": "An order with a PO Box",
+      "event_attributes": {
+        "topic": "shopify/orders/create",
+        "data": {
+          "admin_graphql_api_id": "gid://shopify/Order/1234567890",
+          "name": "#1030",
+          "shipping_address": {
+            "address1": "123 Main Street",
+            "address2": "PO Box 243",
+            "city": "Springfield",
+            "company": "Widgets Inc",
+            "country": "United States",
+            "first_name": "Marge",
+            "last_name": "Simpson",
+            "phone": "+1-855-553-4763",
+            "province_code": "IL",
+            "zip": "62701"
+          }
+        }
+      }
+    },
+    {
+      "description": "An order without a PO Box",
+      "event_attributes": {
+        "topic": "shopify/orders/create",
+        "data": {
+          "admin_graphql_api_id": "gid://shopify/Order/1234567890",
+          "shipping_address": {
+            "address1": "123 Main Street",
+            "address2": ""
+          }
+        }
+      }
+    }
+  ],
+  "script": "{% assign tag_to_add = options.tag_to_add__required %}\n{% assign send_email_notification = options.send_email_notification__boolean %}\n{% assign email_recipient = options.email_recipient__email %}\n{% assign email_subject = options.email_subject %}\n{% assign email_body = options.email_body__multiline %}\n\n{% comment %} \n  Check address lines 1 and 2 for a post office box\n  The matching logic strips out all spaces and special characters,\n  then matches against one of several strings followed by a digit\n{% endcomment %}\n\n{% assign order_has_po_box = false %}\n{% assign po_box_regex = \"(POB|POBOX|POSTBOX|POSTALBOX|POSTOFFICEBOX|BOXNUMBER|BOXNO|^BOX)\\d+\" %}\n\n{% assign po_box_match1\n  = order.shipping_address.address1\n  | scan: \"[A-Za-z0-9]+\"\n  | join: \"\"\n  | upcase\n  | match: po_box_regex\n%}\n{% assign po_box_match2\n  = order.shipping_address.address2\n  | scan: \"[A-Za-z0-9]+\"\n  | join: \"\"\n  | upcase\n  | match: po_box_regex\n%}\n\n{% if po_box_match1 or po_box_match2 %}\n  {% assign order_has_po_box = true %}\n{% endif %}\n\n{% comment %}\n  IF PO Box is detected, add tag to order\n{% endcomment %}\n{% if order_has_po_box %}\n  {% action \"shopify\" %}\n    mutation {\n      tagsAdd(\n        id: {{ order.admin_graphql_api_id | json }}\n        tags: {{ tag_to_add | json }}\n      ) {\n        userErrors {\n          field\n          message\n        }\n      }\n    }\n  {% endaction %}\n\n  {% if send_email_notification %}\n\n    {% comment %}\n      Show error if emails are enabled and any of the fields are missing\n    {% endcomment %}\n    {% if email_recipient == blank or email_subject == blank or email_body == blank %}\n      {% assign error_message = \"Email Notifications are enabled, please add:\" %}\n      {% assign error_topics = array %}\n      {% if email_recipient == blank %}\n        {% assign error_topics = error_topics | push: \"- a valid email recipient\" %}\n      {% endif %}\n      {% if email_subject == blank %}\n        {% assign error_topics = error_topics | push: \"- an email subject\" %}\n      {% endif %}\n      {% if email_body == blank %}\n        {% assign error_topics = error_topics | push:  \"- an email body\" %}\n      {% endif %}\n      {% capture error_message %}\n        {{- error_message }}{{ newline }}\n        {{- error_topics | join: newline }}\n      {%- endcapture %}\n      {% error error_message %}\n    {% endif %}\n\n    {% action \"email\" %}\n      {\n        \"to\": {{ email_recipient | json }},\n        \"subject\": {{ email_subject | json }},\n        \"body\": {{ email_body | newline_to_br | json }},\n        \"reply_to\": {{ shop.customer_email | json }},\n        \"from_display_name\": {{ shop.name | json }}\n      }\n    {% endaction %}\n  {% endif %}\n{% else %}\n  {% log \"No PO Box detected\" %}\n{% endif %}",
+  "subscriptions": [
+    "shopify/orders/create"
+  ],
+  "subscriptions_template": "shopify/orders/create",
+  "tags": [
+    "Address",
+    "Auto-Tag",
+    "Orders",
+    "Shipping"
+  ]
+}