Hi all, I am running Win2k server with Exchange 2000 server. I configured my smtp server to do not allow open relay without Basic Authenticaion. But the problem is I am seeing somany queues are waiting in my SMTP queue. I enumerated the messages and checked, they are pointing to me as a delivery failures. And my badmail directory is filling up. Can anybody tell me How outsiders are connecting and generating the messages to be delivered or sending spam emails using my server. And what are the default ports to be opend ? What are the steps to be taken??? When I enter 'netstat' at the command prompt I am seeing somany ports open! Please help me! Thank you in advance! Rao.