You can adjust who's allowed to post to channels or use mentions that notify all channel members. This helps keep large channels, like those used for announcements, on topic and free from distraction.
Note: Owners and admins can restrict who can set posting permissions. If you don’t see this option, find an owner or admin and ask for help.
Manage who can post in channels
On all subscriptions, you can change who can post messages in the #general channel. On the Business+ and Enterprise Grid subscriptions, you can change who can post in any channel. A channel will be read-only for anyone without permission to post.
From your desktop, open the channel that you'd like to adjust posting permissions for.
Click on the channel name in the conversation header.
Select the Settings tab.
Next to Posting permissions, click Edit.
Select who can post and reply to messages.
Click on Save changes.
Tip: On the Business+ and Enterprise Grid subscriptions, owners and admins with permission can manage channel posting permissions with channel management tools.
Manage who can notify a channel
On all subscriptions, you can change who can use @everyone to notify all members of the #general channel. On the Business+ and Enterprise Grid subscriptions, you can also change who can use @here or @channel to notify an entire channel at once.
From your desktop, open the channel that you'd like to adjust posting permissions for.
Click on the channel name in the conversation header.
Select the Settings tab.
Next to Posting permissions, click Edit.
Tick or untick the box next to Allow @here and @channel mentions. (For the #general channel, you’ll see Allow @everyone mentions.)
