@maiki @SaraDev thanks so much for the helpful and detailed replies!
I can confirm I have the “Accept emails from anonymous users with no accounts” enabled on the private category.
We have chosen to use categories rather than groups because theses are support email; we would like to move good questions over to the visible part of the side once they have been answered.
Can anyone suggest a workaround on how to use this with categories. I hope this use case can be supported some how?