[Exim] Checking if a domain is in a named domain list?

Hi All...

I am interested in executing a warn in the rcpt ACL if the domain that the
message is addressed to is in the named list of local domains.

Trouble is, I don't know how to test for that in the condition. It seems
all the lookup methods operate on filed and databases, but not named lists.

Is it possible to check to see if $domain is a member of a named list of
domains?

Thanks.