help: Document updated setting to restrict wildcard mentions.

Also drop extraneous details.
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Alya Abbott 2023-11-23 13:49:58 -08:00 committed by Tim Abbott
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{!admin-only.md!}
Organization administrators can set a policy for which users are
allowed to use [wildcard
mentions](/help/dm-mention-alert-notifications#wildcard-mentions) in
large streams (defined for this purpose as streams with more than 15
subscribers).
Zulip allows anyone to use wildcard mentions in streams with at most
15 subscribers. The default allows only organization administrators to
use wildcard mentions in large streams.
Users permitted to use wildcard mentions by the organization's policy
are warned that wildcard mentions will result in all subscribers
receiving email and mobile push notifications.
Organization administrators can configure who is allowed to use [wildcard
mentions](/help/dm-mention-alert-notifications#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 `@stream`) in streams
with more than 15 subscribers, and `@topic` in topics with more than 15
participants.
{start_tabs}
{settings_tab|organization-permissions}
2. Under **Stream permissions**, configure
**Who can use @all/@everyone mentions in large streams**.
1. Under **Stream permissions**, configure **Who can notify a large number of
users with a wildcard mention**.
{!save-changes.md!}
{end_tabs}
## Related articles
* [DMs, mentions, and alerts](/help/dm-mention-alert-notifications)