installed spanassain into evolution 1.4.5

directs spam to spam folder under inbox -- and works great!

my question
Is there some way to tell spamassain that certain newsgroup emails are NOT
spam?
ie - i get mail from majordomo@descent-source.net
its not spam, but is captured as such.

what file to tell spamassain if something is to be allowed, and what to tell
it

thanks in advance

charles@ktc.com