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Barracuda Email Gateway Defense
formerly Email Security

How to Deploy the Barracuda Outlook Add-In

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The Barracuda Outlook Add-In supports Microsoft Exchange Server 2013 and higher, Outlook versions 2013, 2016, 2019, 2021, Outlook for Office 365, and Outlook Web Access (OWA) running on Windows and Mac OS.

See also Barracuda Outlook Add-In User Guide .

If you are experiencing issues deploying with Microsoft Exchange Server 2013, ensure that TLS 1.2 is enabled in .NET. Refer to this Microsoft article for more information on updating and configuring the .NET Framework to support TLS 1.2.

Use the steps in this article to deploy the Barracuda Outlook Add-In to all users in your Exchange Server. 

The Barracuda Outlook Add-In allows users to perform various functions, including:

  • Send encrypted emails;
  • Mark emails as suspicious and send to Barracuda Networks for further analysis;
  • Provide additional feedback as to why the email should be blocked.

Install Outlook Add-In for all Users

Note that the user interface will vary depending on the Microsoft Exchange version you are using. The instructions below use Office 365 to install the Outlook Add-In. For more information on how to install an add-in for your Exchange version, see the Microsoft article

  1. Log into the Exchange Admin Center as the administrator:
  2. From the left-hand menu, expand Organization, and select Add-ins.
  3. Click +, and from the drop-down menu, select Add from AppSource:
  4. At the top of the page, in the search bar, type barracuda. Select Barracuda Essentials for Outlook from the Suggested Apps results.
  5. Click Get it now.
  6. Fill out the required fields and select the check box to consent to the terms of use. Click Continue.
  7. Click Yes to confirm the installation.
  8. Go back to the Organization > Add-in section in the Exchange Admin portal. Double click Barracuda Essentials to open the App Settings dialog box and specify the user defaults.
    1. Optional, enabled by default – When selected, the Outlook Add-In is automatically enabled for all users; note that users can disable from within Outlook.
    2. Optional, disabled by default – When selected, the Outlook Add-In is disabled for all users; note that you will need to send users instructions on how to enable the add-in. This is the default setting.
    3. Mandatory, always enabled. Users can't disable this add-in – When selected, the Outlook Add-In is automatically enabled, and users cannot disable the add-in.
  9. Click Save.

Remove Add-In

If you need to remove the add-in from your Exchange Server and Outlook/OWA for all users:

  1. Log into the Exchange Admin Center
  2. From the left-hand menu, expand Organization, and select Add-ins.
  3. Select Barracuda Essentials from the list of installed add-ins and click the trash icon to remove.
  4. Confirm that you want to uninstall the add-in.
  5. The add-in is now removed from all instances of Outlook and OWA in your environment.


User has added or removed app but change does not display in OutlookIt may take some time after adding or removing the add-in for the Outlook client or OWA for the Outlook ribbon to update. If users cannot see the change, direct them to either restart the client or refresh the web page.
Message Action is disabledIf a user turns off the reading pane while a message is selected, the Message Action option is disabled. In this instance, Message Actions is disabled on the user's Home ribbon in Outlook but enabled in the detailed view. Direct users to turn on the reading pane and reselect the message.

Error Message: Unable to add encryption client. The attachment path was invalid.

The Barracuda Outlook Add-In displays this message if your Microsoft Outlook is not installed in the default location. The Barracuda Outlook Add-In is not able to perform encryption with this configuration.
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