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smtpd_helo_required = yes# fighting spam; adapted from:# http://dadabase.de/weblog/archives/2006/08/04/postfix-anti-spam-configuration/# and others# 1. client restrictions##smtpd_client_restrictions =    permit_mynetworks,    permit_sasl_authenticated,    reject_invalid_hostname,    check_client_access pcre:/etc/postfix/client-access-whitelist,    check_client_access pcre:/etc/postfix/client-access-checks,    reject_rbl_client dynablock.njabl.org,    reject_rbl_client sbl-xbl.spamhaus.org,    reject_rbl_client relays.ordb.org,    permit# 2. helo restrictions##smtpd_helo_restrictions =    permit_mynetworks,    permit_sasl_authenticated,    reject_invalid_hostname,    reject_non_fqdn_hostname,    permit