It is a little while since Proton Technologies announced that ProtonVPN was being open sourced to help build trust in the service. Now the company has done the same for the Android version of ProtonMail, and this means that all ProtonMail and ProtonVPN apps are now open source Just as with ProtonVPN, the open sourcing of ProtonMail opens it up not only to the scrutiny of anyone who cares to trawl through the source code, but it has also been subjected to a third-party security audit.

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