Spamassassin Issue

[gateway]

I have been downloaded Plesk 8 for windows and installed in my server but I found that spam filter tab blocked in the mail area ;even though it shows me that spamassassin installed in the compnent area?why?

 

[kaio]

Maybe your license key does not include Spamassassin support

 

[gateway]

I don't know, but I just downloaded Plesk as demo version.