Ограничение того, кого можно упомянуть?

[Jagster (Jakke Flemming)]

Эта тема в основном совпадает с этой:

Restrict who you can PM based on Groups

Hi Discourse Community! We’re using groups and categories to restrict what users can see/which forums they can participate in. This is mostly for privacy reasons/so that people aren’t inundated with topics that do not apply to them. However, we’ve noticed that when you @mention people, or when you private message them, you can actually tag (or reach out to) any user on the platform. With the @mention, you get a warning saying that you’re mentioning someone who doesn’t have access, which is sup…

решение для ограничения личных сообщений, а не для упоминаний

Discourse Restrict PMs to certain Groups