[exim] forwarding router

I am trying to forward a large number of users mails to a variety of new
addresses. I was thinking I could do this with a redirect router
(below)...

my_forward_router:
        driver               = redirect
        data                 = ${lookup{$local_part@$domain} 
nwildlsearch{my.forward}}

This seems to work, unless a delivery is deferred, for example...

R=dnslookup T=remote_smtp defer (-53): retry time not reached for any host

and then a forced retry is done using the -M <message id> or -R <string>
command line commands. When this happens, the message is delivered to the
un-forwarded address.

What am I missing? It seems like it is skipping my redirect router the
second time through.

Thanks,

Dan