protonmail-bridge : Serves Proton Mail to IMAP/SMTP clients ( https://proton.me/mail/bridge https://github.com/ProtonMail/proton-bridge/ )
protonmail-bridge-bin : The Bridge is an application that runs on your computer in the background and seamlessly encrypts and decrypts your mail as it enters and leaves your computer. ( https://protonmail.com/bridge/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a bentoo
For Paludis use this rsync : rsync://gentoo.zugaina.org/bentoo-portage
If you have a problem : ycarus(-at-)zugaina.org