Great email client for Android  if you have the skill and patience to set up your IMAP accounts manually. Ability to adjust FONT size is limited when using on a Tablet. On a high-res screen  you'll need your magnifying reading glasses. I'm running K9 on my Chromebook via the Google ARC Welder re-packaging environment. It works well except you can't deal with attachments because K9 doesn't know how to deal with the Chrome OS file system. (Chrome OS is lacking a complete email client for combining email accounts.) Build a Chrome OS version  and give us older folks larger fonts and this would be a five star app.
December 05 2015