Generate a 3-star review (1 being lowest and 5 being highest) about an app with package com.fsck.k9.
The answer to this question is:
Free  open but painful to look at Feature rich and works really well. I love that it's open source. The user interface is very dated  though. Text and buttons are crammed on my display. Colors are less than appealing. Terrible UX makes this difficult to use.