I have an SBS 2003 Server using No-Ip's alternate port smtp sevice. This has a cap on daily outgoing email traffic. I use this to get around sending mail from a dynamic IP (comcast).
Someone suggested that for specific domains forwarded through this server, I could set up a 2nd SMTP server and filter messages for just say, comcast.com, through the ISP's mailserver instead.
How can I set something like this up in Exchange?