I could not live without Airmail. I use it on the desktop and on my iPhone and iPad and even iWatch. Airmail took email and redefined it, they have actually managed to make email fun again and managing emails a breeze. I truly could not function without it and once you adapt to using it you wont turn back.
This is the ultimate desktop and on the go email app. I deal with an average of 300 emails daily. While Im away I can open Airmail in the morning on my iPhone, quickly sweep through messages, do deletions, mark things as important and file things away and when I get home and open Airmail on the desktop, voila it syncs within minutes and is a mirror of what has been done on the iPhone for the past week. Pure Magic.
There are problems that crop up when you update the apps and especially on iOS devices you should follow my tips below after every app update.
Go to settings of all your gmail accounts > server settings > refresh tokens.
Then go to settings on each gmail account and click Reset message cache.
Thanks to Airmail support for these suggestions but this should be documented.
MK-SouthAfrica about Airmail - Your Mail With You, v1.6.9