Restrict wildcard mentions
Organization administrators can configure who is allowed to use wildcard
mentions that affect a
large number of users. In particular, an organization can restrict who is
allowed to use @all (and, equivalently, @everyone and @channel) in channels
with more than 15 subscribers, and @topic in topics with more than 15
participants.
This permission can be granted to any combination of roles, groups, and individual users.
- Go to Organization permissions.
- Under Channel permissions, configure Who can notify a large number of users with a wildcard mention.
- Click Save changes.