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Direct Mode and Hub Mode

Import Policy can operate in two modes:

Direct mode

In this mode, Event Import passes events directly to a local policy engine. This is the simplest way to deploy Import Policy.

Hub mode

This mode is more complex to deploy, but allows you to use multiple policy engines to process imported emails, and to specify active and standby policy engines (see Active and standby policy engines). In this mode, Event Import passes e‑mails to a policy engine connector (that is, a hub), which in turn assigns e‑mails to an available policy engine.

Both modes are illustrated in the Architecture Diagrams section. See the reference below.

More information:

Architecture Diagrams