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Prerequisites
Your MX records only change if xorlab replaces your existing gateway. See Review What Changes in Your Environment for what each topology changes in your mail flow, what stays untouched and how to undo it.

Inline mode diagrams

In Inline mode, xorlab filters all emails and sends the benign ones to the next hop. Depending on if xorlab is the gateway or an add-on, the integration looks different.

Monitoring mode diagrams

In Monitoring mode, xorlab receives only a copy of every email and discards it after processing. The copy can be setup either on the gateway or on the Exchange server.
EvaluationIf you plan to evaluate xorlab as an add-on to an existing solution, setup the BCC on the Exchange server. In this way you can quickly evaluate the additional security that xorlab provides on top.

BCC from gateway

BCC from Exchange

The diagrams show Exchange and a generic gateway, but the interface is plain SMTP: any other MTA or secure email gateway can take the place of the gateway shown. See Advanced SMTP Configurations for multiple next hops, per-domain routing, and TLS enforcement.

Multi-Tenancy

If you protect more than one organization with the same xorlab instance, follow Add a Tenant instead of the table above. It uses the same guides, but adds the per-tenant configuration around them: