Outstanding  and getting better Update (Dec 2015). Still by far the best email client. /// (2013) I have used K9 for several years for my non-gmail account. The current official version is 4.409  and it is excellent. However  today I installed the latest version posted at the K9 Mail developer's site  4.512  and additional improvements make this email client stand out by some distance. Even in comparison with Gmail. Wow!
December 14 2015