[exim] Routers senders option, multiple senders?

Hello Everyone:

I am trying to apply a outgoing email redirect to a few addresses in
my domain. After browsing the archives for a while, I came upon this
router:

  sneaky_copy:
  driver  = redirect
  senders = abc@xxxxxxxxxxxx
  data    = def@xxxxxxxxxxxx
  unseen

This worked great for me, but I'm trying to get it to have multiple
addresses in the senders = option. I have tried comma separated list,
semi-colon separated list, quoted list, but nothing seems to work
(there are no errors reported).

I would like for it to lookup from a file, and match the senders
address to the foward address. I know I need to look at lsearch, but
I'm a bit lost as this is my first time with exim configuration. Can
someone please point me in the right direction?

Thanks,
Burhan