I was answering a question @ http://forums.iis.net on SMTP scripting. I ran across a couple links I wanted to share.
Programatically configure SMTP service on IIS to route mails to a domain
http://blogs.msdn.com/mahjayar/archive/2004/11/08/254202.aspx
'SMTP scripting examples.
http://www.microsoft.com/technet/scriptcenter/scripts/iis/iis6/smtp/default.mspx