Kevin,
> -What version of Linux is E-Smith built off of?
Red Hat 7.1 This is in the documentation - you might want to take some time to read the material you will find on this web site.
> -Is there a way to make it so that I don't get asked for a
> username and password when I try to view my E-Smith server
> through Network Neighborhood (Windows XP in a workgroup)?
Not sure exactly what you are asking here - but I'd say this question goes to your last one below. The answer will depend on how you set up your SME server, and how you set up the i-bay "share" security.
> -What port do I need to open up on my firewall to allow email
> through to IMP? (I am running E-smith as a stand alone server)
Mail is transferred using SMTP on port 25. It has nothing to do with what mail client you are using, such as IMP (which is just a web browser based mail client - BUT a nice one!).
> -What is a Workgroup and Domain Controller? I know what a
> domain controller is, but I've never heard of a Workgroup
> Controller.
The Workgroup setting just means that your SME server will act as a peer-to-peer type server, NOT act as a Windows NT based PDC(primary domain controller). How you set up SME depends on your unique needs and network situation, ex. do you already have a Windows NT PDC running on your network?
Hope this helped. Let us know if you have some follow up questions. Good luck.