Hebrew spam

Every day my server is getting pounded with HTML spam emails containing Hebrew characters. I'd love to have a simple set of rules to reject during SMTP session with a 55x code any email containing such character sets that I can't read anyway. I'd also like subjects of detected spams (which I don't train otherwise) to be utilised to reject during SMTP session with the 55x code. Both of these are better than accepting and sorting in a "Spam" folder, as the sending machine needs to know that its email isn't getting through. And if there are any false positives, they will never know unless we reject the SMTP session!