There are different ways to select the content of autoresponder depending on the products that were purchased.We have that functionality implemented through the Datasources. This is set of data that will be selected from your store database, inserted into the macros and then into email.
It can be a list of products selected according to some criteria, user details (name, email etc), store details (name etc). This information is specific for each customer and is selected basing on customer's very own order history.
For more information please see the Manual