I can't say enough good things about this program. One of my favorite features is that you can enable 'auto-whitelisting' for various people. For instance, someone calls your help desk and complains that they can't e-mail you due to their mail server being listed on a blacklist.
Easy. Enable the auto whitelisting and send the person that called an e-mail. They are automagically added and can now e-mail your company/server.
One of the other nice things about it is that it is not mail server software specific. At a bare minimum it just needs the Windows 2000 or Windows 2003 SMTP service since it registers itself into the event sink of the SMTP service. So, for instance, you could setup a little 2000 or 2003 box as your smarthost for your business, and have a qmail server, Exchange server, Domino server, and Postfix server sitting all behind the ORF software, in theory.
Typical installs are on top of Exchange 2003 server, or on another server outside of the Exchange server.
Either way, I can't say enough good things about the program.
I've had good conversations with Peter at Vamsoft over various bugs and fixes the past few years and they always get back to me quickly. I can't say that about a lot of other places.
Read more about it here:
http://www.vamsoft.com/orf/beta/
They also have an RSS feed here:
http://www.vamsoft.com/orf/rssnews.asp