>>> list element: @
>>> list element: @[]
>>> exim.test.ex in helo_lookup_domains? no (end of list)
->>> host in limits_advertise_hosts?
->>> list element: !*
>>> host in dsn_advertise_hosts? no (option unset)
>>> host in pipelining_advertise_hosts?
>>> list element: *
>>> list element: @
>>> list element: @[]
>>> exim.test.ex in helo_lookup_domains? no (end of list)
->>> host in limits_advertise_hosts?
->>> list element: !*
>>> host in dsn_advertise_hosts? no (option unset)
>>> host in pipelining_advertise_hosts?
>>> list element: *