How can discourse administrators turn off personal messages

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3

You can switch off these:

This image depicts a screenshot of a settings page for a messaging platform, featuring two options: allowing other users to send messages and chat directly, or only allowing specific users to do so. (Captioned by AI)
This image depicts a screenshot of a settings page for a messaging platform, featuring two options: allowing other users to send messages and chat directly, or only allowing specific users to do so. (Captioned by AI)601×289 12.9 KB

Or just allow certain people to message you.

It’s under Preferences → Users at bottom.

(Note, it might be nice if the second option allowed you to select groups too?)