This is the snap for Proton Mail Bridge, "Proton Mail Bridge is a desktop application that runs in the background, encrypting and decrypting messages as they enter and leave your computer". It works on Ubuntu, Fedora, Debian, and other major Linux distributions.
Published for 
with 💝 by Snapcrafters
sudo snap install protonmail-bridge
You need to have a keychain in order to run the Proton Mail Bridge. To allow
access to the keychain, you have to manually connect the
password-manager-service
plug.
sudo snap connect protonmail-bridge:password-manager-service |
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| Pedro Avalos Jimenez |