Deleted computer object still in TMG

So I used to have a SharePoint server on IP 10.10.2.6. It required some specific rules to function through TMG, hence I created a Network Object / Computer entry for it.

This server was removed months ago from AD and TMG, I recently setup a new Exchange server, re-cycling the IP address 10.10.2.6. Now that my Exchange publishing rules point to 10.10.2.6 in the logs, I am seeing the Destination as: Local host (SharePointServer.domain.local 10.10.2.6)

instead of ExchangeServer.domain.local.

I have a Network Object / Computer entry for the Exchange server, but still in the logs 10.10.2.6 seems somehow associated with the Sharepoint server. I'm having issues with traffic to the Exchange server and so far this is the best lead I have.

So how do I get completely rid of the SharePointServer in TMG?