Hi! I want to make sure that users know about a certain rule before posting in a certain category. Can I show a message to users before or after posting in this category and/or send an automated message via Dicobot or Email?

So you want those creating topics in that category to have some guidance? Have you seen What are Topic Templates?

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isaac (Isaac Janzen) 2022 年 9 月 19 日午後 4:39 2

You could display a banner for a given category

トピック		返信	表示
Show customisable message on private topics/categories? Support	5	1150	2021 年 9 月 16 日
Display banner topic only to logged in users? Support	3	1302	2019 年 4 月 17 日
Post or Topic Visibility Support	6	521	2023 年 11 月 8 日
Showing two banners: one to anonymous users, and one for logged-in members Support	5	1326	2019 年 5 月 4 日
"This topic is only visible to those who can see the {x} category" message UX	3	598	2020 年 7 月 16 日