Your customers will be notified by emails once their orders were fulfilled by BSDropshipping. The notification contains the tracking number and item they ordered. This is a default feature provided by shopify itself. it is not BSDropshipping who write the email and send it. If you want to
Active this feature
Deactivate this feature
Know what is email looks like
Edit the notification emails
You need to go to your shopify admin and do the following as shown in the below video: