Hello! More forums have group rules and admin can allow create topic or messages in topic for the guest, I know Discourse use trust level and don’t have classic permission for group, so it’s possible?
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You can also use groups to allow who can read, reply to and create a topic.
Understanding groups and category permissions (security settings)
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Categories have create, reply, read permissions. If you have reply enabled then users in that group can reply to existing topics.
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Yes, but how to set permission for the “guest”? What is a group name?
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See the link in the post above mine. It explains groups. “everyone” is all users (including not logged in users).
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Wait wait though. That doesn’t mean anon can Post: You still have to have an account to Post?
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Damn… I need allow reply on topic for the guest 
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Right. Perhaps I wasnt’ paying attention. Or just didn’t understand the request.
Users who are NOT logged in cannot post. This cannot be changed.
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You could maybe build a plugin to allow users to enter an email at the same time as posting, and use the email to create a Staged User and attribute the post to the Staged User.
That’s a fair amount of work to do nicely, but go for it!
Some discussion on a similar requirement here:
Moving this to feature
If you really want this and want someone to build it, consider posting in marketplace
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