[IMail Forum] Spam Help!

[Lee Cuevas]

I have been fighting Spam all week from my server. Apparently my server is being used as a relay server and really upsetting some people. My upstream is going to shut me off if I cannot get it under control.   I have configured the server to Allow mail to local groups, Refuse NULL <> Senders, Check Valid Sender, Auto-Deny Hacks.   It appears that the mail is using ports in the 3000 range.   What can I do?   Lee Cuevas