Customers who opt-in to email marketing from your WordPress e-commerce site during checkout are added to a specified list on Contactology.
Currently, there is an option to "opt-in" to email marketing during the checkout. However, this option only provides the store owner with permission to send emails to the customer.
It does not add the customer to any third-party email services.
With Shopp + Contactology this issue is resolved. If a customer "opts-in" to email marketing during checkout, then their email, first name, and last name are sent to a specified list on Contactology.