cPanel Email Filter for IP Range

I recently needed to block a large amount of incoming email via IP range in cPanel for a single account versus blocking the IP range on the entire server. This was accomplished using cPanel’s Account Level Filtering for Mail. Here is the filter setting using 192.168.0.0/24 as an example. Rules: Any Header matches regex 192\.168\.\d{1,3}\.\d{1,3} Action: Discard Message