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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 Standard 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.
Plus plan Posting permissions can be set for any channel, except for channels that are shared with an external organization. Anyone on the workspace can manage a channel's setting.
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.
Note: By default, only Org Owners and Admins on the Enterprise Grid plan have channel posting permissions for multi-workspace channels.