[exim] spam block pre spamassasin scanning

Hi
I'm looking for a working example of all the rules one can apply to
block spam , thus making spamassasin the last res aught . I'v got alot
of rules setup but still to much is getting though ..
got fake mx records
got hello syntax checks
got rbls
got grey listing

I'm missing soming thing somewhere ...
Or is there anyone willing to look at my configs and advise me if they
got the time ...
Greg