Centralized Mail-Transport In Exchange Multi-Forest Environments

Outbound messages to the Internet are routed from the Exchange Online organization through your on-premises organization. With the exception being messages sent to other recipients in the same Exchange Online organization, all messages sent from recipients in the Exchange Online organization are sent through the on-premises organization. This enables you to apply compliance rules to these messages and any other processes or requirements, like digital sign emails at your smtp gateway, or that must be applied to all of your recipients, regardless of whether they’re located in the Exchange Online organization or the on-premises organization.

Read more at the ENow Software Blog.

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