About Operating Models

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You can deploy IMSS in different ways depending on how the IMSS server interacts with your existing MTAs and mail servers. There are three operating models:

Standalone model: Deploys IMSS on the same computer as an MTA, such as Postfix.

Sandwich model: Deploys IMSS between an upstream MTA and a downstream MTA.

Proxy model: Deploys IMSS between an upstream mail server and a downstream mail server.

Note

In the proxy model, IMSS is placed at the edge of your intranet without any co-work MTA. This model does not support the use of IP Filtering features (IP Profiler and ERS).

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