ProtonMail Bridge for Linux is a desktop application that integrates ProntonMail's privacy and security features with an email client. This application is compatible with most email clients that support IMAP and SMTP. ProntonMail Bridge is available for Windows, Mac, and Linux.
This application's key feature is that it encrypts all the email messages that you send and decrypts the email messages that you receive to your ProtonMail account. You can save all emails in the email client from which you access your account.
To set up ProtonMail Bridge Linux, perform the step-by-step instructions given on this page.
Step 1 - Download ProtonMail Bridge
Open your default browser on your Linux computer.
Download the ProtonMail Bridge for Linux from the manufacturer website.
Step 2 - Install ProtonMail Bridge for Linux
Method 1 - Using an RPM file
Download the public key (bridge_pubkey.gpg) to the current working directory.
To import the public key, enter the sudo rpm --import bridge_pubkey.gpg command line in the Terminal window.
Enter the rpm --checksig protonmail-bridge-1.2.6-1.x86_64.rpm command in the Terminal window. This will check the downloaded RPM package.
If the command you enter runs successfully, you will see the protonmail-bridge-1.2.6-1.x86_64.rpm: digests signatures OK message.
To install the RPM package using your package manager, enter the dnf install protonmail-bridge-1.2.6-1.x86_64.rpm command line.
Note: Ensure that the file name in the commands matches the downloaded ProtonMail Bridge Linux version.
Method 2 - Using a PKGBUILD file
To verify the ProtonMail Bridge for Linux, open Terminal and enter the mkdir /tmp/build && cd /tmp/build command line.
Download the PKGBUILD file. To extract and install it, enter the makepkg -s --install command line.
Method 3 - Using a DEB file
To verify the downloaded Bridge file, use the sudo apt-get install debsig-verify debian-keyring command.
Now, download the bridge_pubkey.gpg (public key) on the Linux computer.
To import the public key into keyring, use the following command lines.