The guy who setup this Exchange box claims that port 25 was blocked so I used DynaDNS to reroute 25 to 24 and told the SMTP server to use port 24 instead of 25. Anyhow to make a long story short I tested port 25 but setting up a FTP server on it and attempted to login via my own network via RDP and was able to get in over the internet; I have not been able to get the guy who setup the DynaDNS accounts as of yet to redirect the mail to port 25. This company now has a new domain (another sister company under their main one) who I setup on Register.com; their email obviously points to port 25. So here are questions: As a temporay fix can I add another SMTP connection to Exchange pointing it port 25, and also creating a additional Publish SMTP route on ISA 2004 which pushes the port 25 traffice to Exchange until I can get the guy to setup the DynaDNS connections to port 25 from 24, while keeping the port 24 emails flowing in? Thanks Andrew