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How to Journal to the Cloud Archiving Service from Microsoft 365 Mail Service

How to Journal to the Cloud Archiving Service from Microsoft 365 Mail Service

This article applies to the Barracuda Cloud Archiving Service and Microsoft 365 Exchange Online.

See also:

Note: If you have not completed the initial setup and user configuration, see the Getting Started section to activate the service and add users:

Use the steps in this article to ensure that a copy of all mail sent from and received by users in Microsoft 365 is sent to the Barracuda Cloud Archiving Service.

Hybrid Deployment

In a Hybrid deployment, where some mailboxes are on-premise Exchange Server and some Microsoft 365 Exchange Online, you must set up a journaling rule on both the on-premise Exchange Server and Microsoft 365 to capture inbound, outbound, and internal mail.

Warning! Hybrid deployment can cause duplicate mails in some environments. This is an issue with Hybrid deployment and not with your Barracuda Cloud Archiving Service. Contact your Barracuda Networks Sales or Support representative for more information.

Use the following articles to set up journaling based on the version of Exchange Server running in your environment:

See also: Microsoft article Journaling

One‑to‑One Journaling

Barracuda Cloud Archiving Service (BCAS) supports journaling from a single mail organization to only one BCAS account; journaling to multiple BCAS accounts is not supported. Beginning August 14, 2025, journaled mail is delivered solely to the first BCAS account in the recipient list.

Ensure your configuration maintains a one-to-one mapping between the journaling address and the associated BCAS account.

To configure journaling via Script:

  1. Go to the Mail Sources > SMTP journaling page.

  2. In the Journaling Setup Scripts > Office 365 Setup Script section, click Download to save the PowerShell script to your local system, or click Show Script to copy the script to your clipboard.

  3. Open Windows PowerShell, and run the script to configure Microsoft 365 to journal mail to the Barracuda Cloud Archiving Service.

If you are unable to run the journaling script and need to manually configure journaling, see Manually Configure Journaling.

Note that journaled mail via SMTP has a maximum message size limit of 150MB.

Continue with How to Configure Microsoft Exchange Online Email Import Using EWS

O365

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