bad.domain		554 match bad.domain
friend.bad.domain	OK
bad-sender@		554 match bad-sender@
bad-sender@good.domain	OK
good-sender@		OK
131.155.210		554 match 131.155.210
131.155.210.17		OK
131.155.210.19		REJECT
reject@this.address	554 match reject@this.address
open_user@some.site	open
strict_user@some.site	strict
auth_client		123456

dunno.com		dunno
foo.dunno.com		reject

44.33.22		dunno
44.33.22.11		REJECT
44.33			REJECT

reject@dunno.domain	REJECT
ok@dunno.domain		OK
dunno.domain		DUNNO

reject@reject.domain	REJECT
ok@reject.domain	OK
reject.domain		REJECT

reject@ok.domain	REJECT
ok@ok.domain		OK
ok.domain		OK
<>			550 Go away postmaster
