From the version 4.2.1, users can add customers' email in the receipt.
To set it up, from your Back Office > RockPOS > Manage > Setup > Receipt > Select "QZ Tray" or "PDF" (In this guide, we take "QZ Tray" as an example).
In step 3 of setting up receipt process:
- Drag the "Customer email" tag in the "Customer" block to your editor to show customer's email in the receipt
- Save the change
You can see how it is in the preview panel.