[exim] smart router with verification

We have a smart router setup like this in two parts:



smart_route:

driver = manualroute

route_data = ${lookup{$domain}lsearch{/etc/staticroutes}}

transport = remote_smtp_smart



second part:



remote_smtp_smart:

driver = smtp

port = 26

hosts = ${lookup{$domain}lsearch{/etc/staticroutes}}

hosts_override

We have in the staticroutes localdomain.com:      remote server ip

And have 3 domains being forwarded.



What I am trying to do, setup a flat file with email addresses and do
some sort of recipient verification on it.

I am a newb when it comes to exim, so if I could please have some
direction.

Thanks!