anyone got experience doing this?
i need to try to limit the amount of spam coming through a mail server
the mail is coming through a postfix server and mailscanner checks with some list, but the amount of spam is growing rapidly

i tried to do header checks in postfix using regular expressions, but with very little success, few of the ones i wanted to catch were caught, and some that should have passed, were caught, for no reason i could see.
i believe it is better to use mailscanner rather than the postfix for checking, but i have no experience in either.

any pointers or links to exceeeding basic instructions would be good
the sever is remote to me, but i can access using webmin, the linux is
CentOS Linux 4.0