AS a matter of convenience, have one app that has two sections, the top that show multiple proton (or encryption standards compliant) user encrypted accounts/email addresses, and a lower section that lists other un-encrypted, map compatible accounts that can also be clicked on and read. This would make the proton app a clearer replacement for say the iOS mail app as a single point of access for all mail.
AS a matter of convenience, have one app that has two sections, the top that show multiple proton (or encryption standards compliant) user encrypted accounts/email addresses, and a lower section that lists other un-encrypted, map compatible accounts that can also be clicked on and read. This would make the proton app a clearer replacement for say the iOS mail app as a single point of access for all mail.