[exim] redirection based on sender domain?

Hello,

how can I redirect messages based on the sending domain?

When using the 'senders' router option, lsearch won't expand s/th
like "*@doma.in". When using a condition, I will need to set up a
regexp.

I guess there is a smarter way of doing it but can't figure it out
right now <excuse>spent the night programming SQL</excuse>. Can
someone please enlighten me which road to take?

In the archives there's a way how to do it in ACLs, but I have to do
it after another router.

TIA,
vt