LOCAL_CONFIG
#dynamic relay authorization control map
Kdrac btree /etc/mail/dracd
LOCAL_RULESETS
SLocal_check_rcpt
#allow recent POP/IMAP mail clients to relay
R$*	$: $&{client_addr}
R$+	$: $(drac $1 $: ? $)
R?	$@ ?
R$+	$@ $#OK