You can send emails to customers using triggers and filters. In such a case, you would choose After Sales and enter the number of days the customer has been inactive before sending the email.
There are several other triggers besides After Inactivity including Immediately, Fixed Date, After Sale, and After Initial Sale. In addition to triggers, the emails can be targeted to a very specific group by adding filters such as the specific product(s) purchased, rental or purchase, product type, category, country, and several factors.
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