Set up still a mess! 2017 UPDATE (original review 2013) - For approx' 5 years I've used K9 as my main email client. The setup is still a problem  complete hit or miss. Hours are spent on forums trying to find the correct settings for accounts to work correctly. The auto settings used by the app simply do not access accounts (Yahoo!) correctly. The best app ONCE SETUP  but setup really makes this awful.
January 01 2017