I have a DOMINO 8.5 on RedHat Ent Server and Cisco ASA 5510/ SPAM filter protecting it. ASA and SPAM module is up to date. And also Domino is not on Open Relay. (25, 80 and 21 ports are visible to out side.)
But we have a huge SPAM issue, outsiders use this server as a SPAM relaying server and it's generating about 100,000 emails per day.
I'm completely new to Domino Email server so, experts please help me to start trouble shooting this.
Thanks a lot !