I got the Helpdesk up and running to the point where I can create and manage tickets using the web interface. That part all works fine. However, I can only create the ticket using email but none of the further ticket activity is sent back to the customer. No ticket excepted, no notes, status changes, nothing. Those only show up in the web interface. What am I missing? Test emails all work.
You will need to go to Configure-> email settings. Scroll down the page where you see Outgoing email templates. There you can set up the conditions for out going emails. Such as when a ticket is updated, the state changes, etc.