ProtonMail Bridge Microsoft Outlook for Windows 2019 setup guide

ProtonMail Bridge is an open-source application that allows you to fully integrate your ProtonMail account with any program that supports IMAP and SMTP. This includes Microsoft Outlook, Mozilla Thunderbird, and Apple Mail.

It runs in the background on your computer and seamlessly encrypts and decrypts your mail as it enters and leaves your computer.

Before you configure Outlook to use ProtonMail, you must first sign up for a ProtonMail account and download and install ProtonMail Bridge on your computer.

Once you’ve installed and added your account(s) to ProtonMail Bridge, you will need to configure your email client. ProtonMail Bridge works with most email clients and applications that support IMAP / SMTP connections.

In this guide, we provide step-by-step instructions for configuring Outlook 2019 for use with ProtonMail Bridge. Watch our video guide, or follow the step-by-step instructions below.

How to set up Outlook 2019 for ProtonMail Bridge

1. Open Outlook and go to the File tab → Account InformationAdd account.

 Add account

2. Enter your email address, select Advanced options and check Let me set up my account manually.

 Enter your email address,

3. Select IMAP.

Select IMAP

4. Enter all account details shown in the ProtonMail Bridge app. Then click Next.

IMAP settings

5. You will be asked to enter your ProtonMail Bridge password twice (for IMAP and SMTP). Note: The password you must use is automatically generated from ProtonMail Bridge. Do not use your regular ProtonMail password.

Enter your ProtonMail Bridge password twice

Note: Do not use your regular ProtonMail account details. You must use the account details provided in ProtonMail Bridge under Mailbox details

Find your account details in the ProtonMail Bridge app

Click Connect when you are ready.

6. You may see a security warning. If you do, click Yes.

Security warning

7. Go to File Account Settings   Account Settings…

Account Settings

8. Select your ProtonMail account and click Change…


9. Under Mail settings, check Do not save copies of sent items, and Purge items when switching folders while online. Click Next.

Change settings

Setup is now complete and Outlook 2019 is ready to use ProtonMail Bridge.


1. In split addresses mode every IMAP account that you set up with ProtonMail Bridge is address-specific, and will only be able to send and receive emails from the address it is set up with.

You can add any number of addresses to Outlook, but wait for one address to download before adding another.

2. In combined address mode, Outlook has no way to add more than one address to send with.

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