>>> list element: @
>>> list element: @[]
>>> some.host in helo_lookup_domains? no (end of list)
+>>> list element: *
+>>> host in limits_advertise_hosts? yes (matched "*")
>>> host in dsn_advertise_hosts? no (option unset)
>>> host in pipelining_advertise_hosts?
>>> list element: *
>>> list element: @
>>> list element: @[]
>>> some.host in helo_lookup_domains? no (end of list)
+>>> list element: *
+>>> host in limits_advertise_hosts? yes (matched "*")
>>> host in dsn_advertise_hosts? no (option unset)
>>> host in pipelining_advertise_hosts?
>>> list element: *