Mine

smtpd_client_restrictions = permit_mynetworks,  permit_sasl_authenticated,        reject_rbl_client relays.ordb.org,        reject_rbl_client sbl-xbl.spamhaus.org
unknown_local_recipient_reject_code = 550
virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf
virtual_gid_maps = static:517
virtual_mailbox_base = /usr/local/virtual
virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf
virtual_mailbox_limit = 151200000
virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_minimum_uid = 515
virtual_transport = virtual
virtual_uid_maps = static:515