Hi! I have Small Business Server 2000 with ISA, IIS and Exchange 2K running on it. I know it is not a good thing to run all this together on one Server but I have no choice... Now, few of our users are using & sending mails via SMTP Server on our Server, I want to know how can I stop the spamming or how can I prevent SMTP Replay on my server??? Can someone help me out!! Chirag Shah Network Engineer