Email history - Product purchase Notification is not getting in email history.

Steps to reproduce :

1. Login as admin
2. Go to service menu
3. Click on product
4. Click on create button
5. Fill up details and save
6. Go to order menu
7. click on new button
8. Any product assign to customer
9. Go to email history
10. Then verify Product purchase Notification is not getting

Expected result :

  > Product purchase notification should be displayed properly.