Three support emails have helped me learn than one month of analytics.

In the course of six weeks of the launch i handled all support communications for an invoicing application i developed for freelance photographers personally. No automation, not templates. I was expecting bug reports. Instead I was provided with a blueprint where my product confuses its customers.
Three emails deserve mentioning. One of them was asking about the location of the "send reminder" button it was on a page where users never logged in.Another email made assumptions that deposits and the final payment were interchangeable as my label system had the word to describe these notions.. Finally there was a brief "thank you note" from the wedding photographer, from Cebu stating that the PDF document he received looks exactly like it was generated by his studio. This one was immediately. Hanged to my desk.
The analytical tools showed that users were leaving the dashboard. The emails explained the reasons of doing. As a result I’ve repositioned the "reminder" button. Separated these two labels. Repeat questions disappeared within a week.

Now I am curious how far this signal goes. When did you stop answering every communication and what replaced it?