Airmail Icon - Dock/Menu Bar - Airmail for macOS
You can disable Airmail from being shown in the Menu Bar/Dock. Go to Preference > General and then you could see the option as shown in the picture below.
In the above screenshot you could see a blue box mark, it’s where you could choose either Dock or
Menubar and also you can choose Airmail being shown on both Dock as well as Menu bar.
Updated on: 01/11/2019
Thank you!