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I am not sure how you have set this up. The system user is a user that is created by Discourse to perform various actions.
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Ah, thanks for explaining. I realized I was using the wrong terminology. My account is the “site contact username”, and checking the docs for that setting I see it does say “A valid staff username to send all automated messages from.”
I also realized above I talked about an “email thread” when I actually meant a “PM thread.”