[Exim] Check reverse DNS on senders with exceptions

Is it possible to refuse recipients for sites that don't have reverse
DNS configured, except when the mail contains addresses in
particular domains? This check alone catches a huge number of spam sites
but also generates quite a lot of false positives. For some domains with
users who would rather get spam than miss mail I'd like to turn this
check off.

Thanks,
Paul

--
Paul Makepeace ....................................... http://paulm.com/

"What is jimi hendrix? Fast, then expel worms."
-- http://paulm.com/toys/surrealism/