I need an mail server running on my web server that will just route email through other email servers. Exchange requires Active Directories which just complicates an otherwise simple setup. What are your recommendations for a self contained windows mail server?
One thing I neglected to mention is that the MTA must be able to route email based on the from address. So when someone sends mail from @microsoft.com it should route through mail.microsoft.com and when it sends mail from @apple.com it should route through mail.apple.com