spammers are getting through

This is my postfix setup:

smtpd_recipient_restrictions =
permit_mynetworks,
reject_unauth_destination
check_recipient_access dbm:$config_directory/recipient_access,
check_client_access dbm:$config_directory/access,
check_client_access dbm:$config_directory/helo_access,
reject_non_fqdn_hostname,
reject_invalid_hostname,
reject_unknown_sender_domain
reject_rbl_client list.dsbl.org,
reject_rbl_client relays.ordb.org,
reject_rbl_client bl.spamcop.net,
reject_rbl_client sbl-xbl.spamhaus.org,
reject_rbl_client dynablock.njabl.org,
check_sender_access dbm:$config_directory/spammers
check_sender_access dbm:$config_directory/junk
check_sender_access dbm:$config_directory/freemail_access,
reject_unauth_pipelining

I have added spamhaus and dynablock which has blocked about 60,000
emails daily.

Still I am getting a ton of spam. The viagra and stock people do not
seem to be listed in
any of these RBL's and other ones that I tested.

can some one recommend something?
Thanks