Enable IPs under Windows Server 2012 via script

How do I set up SmarterMail Configuration (Windows 2012) to accept incoming messages only from EuropeanMX servers?

Windows Server 2012 has reached the official End-of-Life (EOL) at Microsoft on October 10, 2023 and Microsoft has discontinued support for this product. The following instructions were correct at the time of writing. However, as this version has reached the end of official support, we can no longer guarantee the success of the configuration.

You can restrict the delivery of messages to your Windows server with a Powershell script so that only messages that are to be delivered by EuropeanMX after filtering are accepted. Once the script has been set up, we recommend that you run it every hour using the Windows Task Scheduler.

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