
Step 9: Find and select the downloaded file. Step 8: Click the Browse button displayed next to Import File. Step 7: Check the box next to Import Existing Digital ID from a File if it’s not already. Step 6: Under Digital IDs (Certificates), click on the Import/Export button. Step 5: Select Email Security listed on the left. Step 4: Click on the Trust Center Settings button displayed on the right. Step 3: On the Outlook Options window, select Trust Center listed on the left. Step 2: Select Options on the next panel. Step 1: With the Outlook desktop client open, click File located in the top left corner. Proton Mail also offers applications for iOS (new window) and Android (new window) for easy access on your mobile device.These instructions assume that you already obtained an S/MIME certificate, downloaded the file to your Windows PC, and have the required password handy. However, this may change in the future to include our Proton Free plan as we develop our infrastructure.


Proton Mail Bridge is currently available only if you have a paid Proton Mail plan.

You can find Proton Mail Bridge for macOS, Windows, and Linux on the Proton Mail Bridge homepage (new window), along with frequently asked questions and detailed setup instructions for each of the supported clients. This includes support for importing emails into your Proton Mail account from other email accounts that are connected to the same client, as well as full-text search of your Proton Mail emails from within your client. It allows you to fully integrate your Proton Mail account with a third-party client that supports IMAP and SMTP protocols, such as Microsoft Outlook, Mozilla Thunderbird, and Apple Mail. Proton Mail Bridge (new window) is an application that seamlessly encrypts and decrypts your mail as it enters and leaves your computer.
