Outpost Firewall Pro has in its Proactive Protection and Application Guard to stop other unauthorised applications accessing them, email clients and browsers typically, but you can add others, see image example of my current exclusions.
You can add it to the exclusions, unfortunately the Outpost pop-up doesn't loiter very long as there is a clickable option there to add it to the exceptions. Otherwise you have to add it manually in the Outpost, Settings, Proactive Protection, Application Guard, Exclusions.