Proton
...# Maintainer: Proton AG (Proton Mail Bridge developers) _pkgname=protonmail-bridge pkgname=$_pkgname-bin pkgver=3.21.2 pkgrel=1 pkgdesc="Proton Mail Bridge is a desktop application that runs in the background, encrypting and decrypting messages as they enter and leave your computer." arch=("x86_64") url="https://proton.me/mail/bridge" license ......
https://protonmail.com/download/bridge/PKGBUILD
Release notes - Proton Mail Bridge - stable
...If you have any questions, please get in touch with Proton customer support or follow the knowledge base instructions: https://proton.me/support/protonmail-bridge-manual-update ....
https://protonmail.com/download/bridge/stable_releases.html
Proton Mail: Get a private, secure, and encrypted email account | Proton
..."DebFile": "https://proton.me/download/bridge/protonmail-bridge_3.21.2-1_amd64.deb", "RpmFile": "https://proton.me/download/bridge/protonmail-bridge-3.21.2-1.x86_64.rpm",...
https://protonmail.com/download/current_version_linux.json