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If the user has content access and is part of the `can_send_message_group`, they can send a message to streams with shared history. We do not allow them to send messages to stream with protected history since they it would go into a void and they cannot see the message later. See https://chat.zulip.org/#narrow/channel/101-design/topic/shared.20history.20can.20send.20message/with/2095398