main.cf:
smtpd_recipient_restrictions =
permit_mynetworks,
permit_sasl_authenticated,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unauth_destination,
reject_unauth_pipelining,
reject_invalid_hostname,
reject_rbl_client bl.spamcop.net,
reject_rbl_client cbl.abuseat.org,
reject_rbl_client dnsbl.sorbs.net,
reject_rbl_client zen.spamhaus.org
@tuaris I believe I used this as a reference. It also has a link to the documentation you need at the top.
http://rob0.nodns4.us/postscreen.html