Apple mail app is in this season.
Basically negates any reason to use airmail on mobile. Should have existed in GM release 3. Here we are in beta and nothing. All I can advise is that the Mac Mail app is now better far and wide than this whole mess. At least enable some antiquated s/mime for now.. but I see this is not an issue to your dev team. Waste of money and should be uninstalling today.
Useless mobile app without this. How is it not even in beta? Now is the time to abandon ship, also found malware from airmail 2 that persisted through Apple store purchase of 3. If you’re at all concerned about security Airmail is not for you.