[Any advice for securing a Windows 10 machine you use as an Internet-facing server?]

I've got a Windows 10 PC acting as an email and an IIS web server connected to a public domain name.

What are some good security measures to employ for the front-facing stuff so no one can dig around on the back end?

[Hiiiiii.... >_>]

Hey y'all. I dropped by when I was reading up on the WUD app.

 

So...um...whatcha got going on here?