Anonymous

smtpd_recipient_restrictions = reject_non_fqdn_sender,  
reject_non_fqdn_recipient,      
reject_unknown_sender_domain,   
reject_unknown_recipient_domain,     
check_recipient_access hash:/etc/postfix/recipient_access,      
check_sender_access hash:/etc/postfix/restricted_senders,    
permit_mynetworks,      reject_unauth_destination,      
reject_rbl_client zen.spamhaus.orgpermit