Sure
As a registered user of the store every time they place an order a new email is sent with a new discount code from this plugin.
They haven’t registered for the newsletter or ticked the box to do so in the checkout yet they receive a discount code anyway.
This means a customer is getting a discount code every time they place an order… Even if they are already signed up to the newsletter…
https://www.sheepdogcoffee.co.uk