I recently installed a Win 2k3 Small Busines Server for a client. I keep finding SMTP connectors in the queues that I don't know where they come from and are obviously not legitimate outgoing e-mail. I have tested for an open relay and found that it is not an open relay, I had this problem before and have learned how to lock it down fairly well. I need to find out where these SMTP connectors are coming from. All of the messages are from postmaster@***.com - does this mean these are auto responses from my email server to bogus incoming mail? We have several e-mail domain names coming in and the badmail file fills up quickly, so I know there is a ton of spam coming through.... Please let me know how to turn off the autoresponder, if that is what it is, or am I a victim of a trojan horse or backdoor spammer?