I'm in the process of updating the aspnethotel.dk website to version 2.5 - It's been a while since I did some major coding on it, so I moved this topic to the top of my TODO list :)
Amongst other things, the mail sending process is getting a major overhaul, so I needed to send mail from my developer machine (of course!), but when I clicked "Send" an error was returned!! DOW .. I forgot to install the SMTP Service, so I went to Control Panel .. only to find that the SMTP server has been removed from Vista !!?
So .. I had to find an alternative, and found these three great alternatives to the (missing) SMTP server in Vista:
Free SMTP Server (runs as an application, which makes it simple to configure for testing scenarios).
http://softstack.com/freesmtp.html
Smartermail (Free for one domain)
http://www.smartertools.com/SmarterMail/Free-Windows-Mail-Server.aspx
MailEnable Standard (Unlimited domains/users)
http://www.mailenable.com/download.asp