Avast Business - Delete SPAM setting?

I have just downloaded Avast Business Antivirus Pro Plus and have installed that on my Exchange Server.
All SPAM mail is marked with *** SPAM *** so it seems to work correctly.

BUT I can’t find any setting to automatically delete SPAM.
I don’t really want SPAMs to reach end users att all. Just want to delete instead of just marking them with *** SPAM ***

Anyone?

Thanks

//Roger