Journaling to two separate 3rd Party Journals

Stuart Moon 0 Reputation points

We currently have a hybrid configuration with two separate on premise domains in hybrid with a single o365 tenant. However, we use Mimecast for Journaling and have separate Mimecast entities for both and is the default domain in o365 and when the system mailbox sends the journal it sends through the configured connector as This is fine for journaling but doesn't work when journaling for users as the as it sees it as an open relay.

Without having separating our o365 tenant or combining our Mimecast entities, is there a way to make this work?

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. Miguel Gonçalves | AVANADE 541 Reputation points

    Hi Stuart,

    Only one journal connector is required on the Mimecast side, and both the on-premises server and Office 365 can be configured to send journal messages to the same email address (e.g., and This approach allows you to handle journaling for both domains without separating your Office 365 tenant or combining Mimecast entities.

    To deploy instructions, you can get tutorials from Mimecast website.

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