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Regarding your query, currently PostBox is not one of the default mailing client in Voila.
Consider your suggestions noted.
Currently there is no such way to teach Voila that you are not using Mail (or any other mailing clients). But, you can hide the mail feature in Voila. To-do so, do a right click on Voila window on the top bar as shown in screenshot below. Next, select 'Customize Toolbar' -> follow the instructions as shown in the screenshot.
Hope it helped.