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Channel members can limit who can post to the channel they’re in, making it read-only for everyone else. This helps large announcement channels stay on topic and free from distraction.
Channel posting permissions by plan
Free and Pro plans Posting permissions can only be set for the #general channel. By default, anyone can manage this channel's posting permissions, unless restricted by a Workspace Owner or Admin.
Business+ plan Posting permissions can be set for any channel, except for channels that are shared with an external organization. By default, anyone can manage a channel's posting permissions, unless restricted by Workspace Owner or Admin.
Enterprise Grid plan Posting permissions can be set for any channel, except for channels that are shared with an external organization. By default, anyone can manage a channel's posting permissions, unless restricted by administrators. Org Owners and Admins can restrict who can manage channel posting permissions for multi-workspace channels.
Note:On the Business+ and Enterprise Grid plans, owners and admins with permission can manage channel posting permissions withchannel management tools.