How to remove tracking numbers from Shopify native email notifications?
A customer who gets a tracking number from Shopify tracks their order on the carrier's site instead of yours. Here is how to remove it.
Ordertracker sends its own shipping email, so you can also disable Shopify's Shipping updated and Local delivery notifications entirely. The app links straight to those settings.
Tutorial
Go to Shopify Notifications settings
In your Shopify admin, go to Settings > Notifications.
Edit the Shipping confirmation template
Scroll down to the Shipping section and click on Shipping confirmation.
Remove the tracking number code
In the template editor, remove or comment out the blocks that display tracking numbers:
{% if fulfillment.tracking_numbers.size > 0 %}
...
{% endif %}
And/or:
{% if fulfillment.tracking_url %}
...
{% endif %}
To comment out rather than delete, wrap the block:
{% comment %}
... tracking code here ...
{% endcomment %}
Repeat for Shipping update
Repeat for the Shipping update template.
Save
Click Save on each template. Your customers now track their orders on your store only.