Implementing a mail server

See the following site,tehre are no spaces in the URL
http://www.itsecurity.com/papers/reflex3.htm

Of course, most internet related applications can be set up for free or at least without software costs using a linux server. You could spend hours completing the setup and months becoming an effective linux administrator or you could take an easier route.

First, even though you said "not for the internet" I assume your network is connected to the internet. Worst case, your computer is obviously connected to the internet and you can share it's dial-up connection with your entire network if you want.

Here is an ideal solution. I'll host your new or transferred domain name and provide instant access to your own mail server, your own control panel for easy administration as well as your choice of three varieties of web-mail client. You can have an unlimited number of email accounts as well as the web-site hosting all for only $20 per month.

The only delay is the 24 - 72 hours it takes to propagate your domain name across the internet. Also, I can register a domain name for you as well. If you want to know more send an e-mail to me . . . Craig Carman craig@ecomyes.com

Have a great day!
Craig

Install Exchange server - it works AD integrated - so it creates email addresses based on the AD user names. Also it creates addresses based on domain name i.e.: user_name@domain_name
There are several free mail servers - just "google" the internet for "free mail server progam".