It can do everything
Airmail is the most powerful and flexible mail client available for both iOS and Mac OS. It has dedicated support for Gmail, and several other mail systems, and handles the special features of each of those. It’s a better Gmail client than Google’s own app.
Tech support is awesome also. I had an issue today that Paul was able to solve through chat very quickly. (I had to reset the message cache)
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Airmail - Your Mail With You