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O365 Hybrid – Centralized Mail Flow vs Non-centralized Mail Flow

Centralized Mail Flow

Centralized Mail Flow enables all outbound messages from both organizations to be routed through the on-premises organization. This allows for additional processing by on-premises message hygiene or compliance solutions.

Non-centralized Mail Flow

Non-centralized Mail Flow is selected by default in the Hybrid Configuration Wizard; Office 365 sends messages directly to the Internet and the on-premises organization continues to send messages as configured before. Alternatively, you can configure the on-premises organization to route all outbound email through Exchange

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