[Exim] address rewriting - need help - attached error

*@*
$lookup{$1}$lookup{$2}lsearch{/etc/mail/exim-forwarders/address.rewrite}{$va
lue}fail) hT


>>> check verify = recipient
>>> mtnns.net in "*"? yes (matched "*")
>>> thomas@??? in "*@*"? yes (matched "*@*")
LOG: Rewrite of thomas@??? yielded unqualified address
"thomas${lookup{mtnns.net}lsearch{/etc/mail/exim-forwarders/address.rewrite}
{}fail}"
>>> mtnns.net in "*"? yes (matched "*")
>>> thomas@??? in "*@*"? yes (matched "*@*")
>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>>> routing thomas@???


Regards,

Tom Kinghorn