Dont buy until airmail fixes the sync issues
Delete an email on your mac in airmail, and and sometimes it stays in your inbox on iPad/iPhone and sometimes it doesnt. Airmail tech support is not responsive to this issue. Dont purchase the iPad/iPhone version until the problem is fixed. A good solution for an all-mac world is airmail on the mac, and outlook on iPad/iPhone.
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Airmail - Your Mail With You, v1.6.4