When a user uses the free post option a double-opt-in registration is required. Their post require admin approval and have a life of thirty days. Later if the user decides to purchase post their ‘free' post automatically convert to paid post and their shelf life automatically changes from 30 days to forever.
Is there a way to set up an automatic email so that after 20 days the user receives an email letting them know that if they don't purchase post their current free post will disappear? If they do purchase post the commenting feature would either be on or off for the lot.