ProtonMail Desktop (Mac) v1.0.6
It runs in the background and can be called from the System Tray. It is an unofficial app and not affiliated with the ProtonMail development at all. It does look pretty good though, displaying your e-mails in a right-side pane from lists of folders on the left.
protonmail desktop email client protonmail
1License and operating system information is based on latest version of the software.
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