samarudge 16 Posting Whiz

Hi all,
I have just got Windows Server 2003 working. I used to use RedHat linux for my server and the SMTP server allowed me to relay emails to another server as I have a dynamic IP so most email providers will not let me deliver my emails. Is there any way to get Windows SMTP to relay the emails to my ISPs SMTP server?
Regards,
Sam Rudge