zulip/templates/zerver/help/announcement-only-streams.md

Announcement-only streams

{!admin-only.md!}

By default, anyone who belongs to a stream can also send messages to the stream. However, sometimes it's useful to have a stream (often a default stream) where only organization administrators can send messages.

Restrict posting to organization administrators

{start_tabs}

{relative|stream|all}

1. Select a stream.

2. On the right, click [Change] next to the description of the stream permissions.

3. Click Restrict posting to organization administrators.

4. Click Save Changes.

{end_tabs}