I need to relay notification mail from a few Windows 2003 servers (IIS 6) that do not have an internet facing NIC. I am able to send HTTP/FTP/SSL/Gopher through a proxy on a server with a WAN facing NIC by configuring in IE7 (tools, internet options, connections, lan settings). However, I don't see anywhere in IIS SMTP to configure this. Is there a reistry key where I can specify this? Is there a different SMTP Server I can install with more configuration options that allow use of a proxy?