IMSS stands for Trend Micro InterScan messaging security suite. My exch server is running well, and I want to setup the above software for antispam/whitelist/blacklist purpose. When I tried to setup, it prompts me port 53 is using on my server, and IP profiler service has to make use of the above port.
Is there a step-by-step guide? I remember smtp port for exchange server has to change to other port?