Zeotrust, mail server and other apps

Hey all. After having a public facing IP address I am now changing providers and have been looking for ways to still host my mail server behing a private ip. I also write software and need to have plc’s send data over TCP protocols back to base.

So I have been trying the Zerotrust. For web based http etc it is easy. I use an external serve\ice to filter our incoming mail but it needs to send it to my server. Can I do that over a Zerotrusttunnel? Is that what the TCP service is as listed in the options?

Also the same with our PLC data. It comes in via TCP streams. Can I use the same? I have been googling but may be using the incorrect search terms…