Is there a way to allow posting anonymously without users signing up in Discourse?
Not while signed out, only users that have an account, you can enable " Allow Users to switch to anonymous mode" site setting in your forum, for users to be able to switch to a completely anonymous account.
If you use email-in, you can setup an email address for a category that will enable “anonymous users” to participate. This requires “staged users”, then in a category :
You need to setup the engage@example.org email address to forward to your installation’s discourse email (the one you POP.)
That looks like a good idea! I followed your link to staged users and do not understand the connection. Could it be that you linked the wrong URL?
Yes, you’re right. I corrected the link.
I have enabled this setting, however, I’m not seeing how you can switch to an anonymous account? How do you do this?
Click or tap your user avatar at the upper right, then the spy / anonymous glyph.
I think they’re talking about staged users here though…
Staged users haven’t logged in so that doesn’t make sense to me? You must log in to be able to switch to anonymous.
Agreed. I think there is some confusion stemming from this:
Yes! Thanks for that. Didn’t notice that inconspicuous little icon before. 
Do you understand that a staged user won’t be able to do that though? They are only interacting with the site via email.
Yeah… Not a problem. The only users I’m concerned about are registered users on my site.
据我所知,这并非核心功能,没有相关插件支持,也未列入核心开发计划:
顺便一提,关于匿名发帖的功能请求已多次提出,目前仅实现了一项:
允许已注册用户在登录状态下匿名发帖
允许未注册用户匿名发帖
允许创建仅支持匿名发帖的分类(即即使已注册用户也只能匿名发帖)
非常希望也能实现这两个功能:
- 允许未注册用户匿名发帖
- 允许一个分类仅包含匿名帖子,即即使注册用户也只能进行匿名发帖
