Scenario I
A customer has already placed goods in the shopping cart. But for whatever reason, he has not ordered. After a defined period of time a mail is automatically sent to the customer, with the listing of his shopping cart, with the reference connected that he receives a discount with order.

Scenario II
A customer has placed an order. After a defined period in which he has not ordered any more, a mail is automatically sent to this customer with the notice that he receives a discount with the next order.

It is cheaper to reactivate existing customers, as a new customer.