Creating an automatic order follow up message.

You will need to use AcyMailing Enterprise's auto filters system:
www.acyba.com/en/support/documentation/1...ymailing-filter.html

Create one filter with "HikaShop user", "bought", "at least one product" with the action "add an e-mail in the queue", select a newsletter you previously created, and the time {time}+2678400
which is the current time plus 31 days in seconds.
Finally, save that filter with the trigger on order confirmation, make sure that the cron system is configured in AcyMailing, and it should work automatically for new order.