How on Exchange to restrict sending WITHOUT authorization to external addresses for the server by IP?

Question

Information Security

How on Exchange to restrict sending WITHOUT authorization to external addresses for the server by IP?
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Receive Connector was created on Exchange with permission for anonymous authorization on port 588, device IP was added.
There are devices, for example, an MFP, for sending scans to the mail. It turns out that if you specify an external address on the device, the sending will also pass. How can I disable it and allow sending only to internal addresses? You can create a transport rule, but you can only specify the outgoing address, not the server...

Answer 1

The simplest: Transport steering wheel. And on the device, use a unique sender address like [email protected]
You can also experiment with headers - because. The sender's IP address is usually added. For example, in X-Origin-IP, or in another header, you need to make a couple of test mailings to yourself and find something unifying in the headers - perhaps by X-Mailer, and other signs.