divert(-1)
define(`_DNSBL_SRV_', `ifelse(len(X`'_ARG_),`1',`bnbl.tcats.stop-spam.org',_ARG_)')dnl
define(`_DNSWL_SRV_', `ifelse(len(X`'_ARG2_),`1',`accept.tcats.stop-spam.org',`_ARG2_')')dnl
define(`_DNSBL_MSG_', `ifelse(len(X`'_ARG3_),`1',`"550 Mail from " $`'&{client_addr} " rejected - listed on '_DNSBL_SRV_`"',`_ARG3_')')dnl
divert(8)
# DNS based IP address spam list _DNSBL_SRV_
R$*			$: $&{client_addr}
R$-.$-.$-.$-		$: <?> $(host $4.$3.$2.$1._DNSBL_SRV_. $: OK $)
R<?>OK			$: OKSOFAR
# site is on the blacklist, check our whitelist to see if it is really desired
R<?>$+			$: $&{client_addr}
R$-.$-.$-.$-		$: <?> $(host $4.$3.$2.$1._DNSWL_SRV_. $: NO $)
R<?>NO			$#error $@ 5.7.1 $: _DNSBL_MSG_
divert(-1)