We have a linux dedicated hosting service of [url removed, login to view] website.
We dont have knowledge on linux systems. The parallel plesk panel doesnt allow us to enable spam protection. The hosting company informed us that the mail server is basic and we can not enable spam protection from the control panel, but we can "perhaps" change settings from linux, and qmail is used for the server.
We can send you all login informations, we need to enable the spam protection, and we need a document showing us how to disable again.
I added the paralel plesk screen showing that the property is disabled according to the server policy...