[Exim] exim3 - trying to get lookup to work

Hi : Im trying to get a router setup in exim 3. I want it to take the IP of
the remote host and see if it matches a list of IPs i have. I cant get this
to work but it looks like it should.

sandbox:
driver = smartuser
# THIS WORKS --->>> condition = ${if eq {$sender_host_address}
(10.5.3.39} {yes}{no}}
condition = ${lookup{$sender_host_address} lsearch
{/usr/local/exim/dev_addresses}}
new_address = developers@???
headers_add = X-From-Host: xxx.com
errors_to = chuff@???

/usr/local/exim/dev_addresses looks like
###########
127.0.0.1
10.5.3.39
10.5.3.16
10.5.3.17
10.5.3.172
10.5.3.176
10.5.3.18
10.5.3.180
10.5.3.181
10.5.3.182
#etc...
###########

anyone notice something im doing wrong? Ive never had to make a
router/director with conditions and string expansions before so im kind of a
newbie with this.



Thanks
--CH