You can change the subject lines of the emails that Shopify are sending to your customers, from within the Shopify admin:

  1. In your Shopify admin, go to the Settings page
  2. Click on the "Notifications" section
  3. Click on the email that you would like to change the subject for, for example the "Order confirmation email"
  4. Update the field "Email subject" (see screenshot below)
  5. Once done, click "Save"
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