I am getting an error in hMailServer log that
some other application is using the ports 25 and 110 please make sure that they are disabled How to find which application is using these port?
From a command prompt, type
This will show you all the ports open on your machine, along with the PID (process id) that has them open.
Look for port 25 and 110 and the PID. Then open Task Manager and find the PID, and you'll find the process name that has them open.