I'm noticing we're getting a lot of spam coming through with a from address of our own domain. This gives spamassassin an automatic -100 on the score pretty much guaranteeing that it'll not get flagged as spam. Since we have a limited number of people using that domain, is there a way to tell spamassassin to block or at least give a really bad score ot any email with a FROM as coming from our domain but is not a user (left of @ sign) that isn't one of these X addresses?
Thanks for any advice! Liam