iOS, not OS X.
Still annoying the default app has to be the IOS built in one though.
Honestly, iOS 8's Mail is so much better than previous releases. Provided that you understand the following, it works extremely well:That pretty much means I just go back to using Mail.
OP - when you say chaotic what do you mean? I find Mail about standard to most email apps, except if I'm using gmail then the gmail app or inbox are probably better to use with gmail features.