[Exim] [OT] exiscan, SpamAssassin and spam_level_stars

Hi folks,

I'm trying to help the Windows folks in our office filter out spam.

SpamAssassin has an option spam_level_stars, that'll give me what I
need.

How do I get exiscan (not exiscan-acl) to enable spam_level_stars, so
that an X-Spam-Level header is added?

Ciao,
Sheldon.