[Exim] resolving fqdns

hi,

i've a problem with exim and resolving of ips:

i use the "unknown_transport"-feature, as described in the exim-faq (q403).
it works nice, but there is one big problem. i'm using dial-up and exim
tries every time, i send a mail to an unknown local user to resolv the
mailserver, named in the configuration.
is there a way to prevent exim from that, like "queue_remote_domains" for
the "normal" outgoing mails? i already tried "queue_smtp_domains" but
theres stille the host-lookup

frank