[exim] mail bombed

    We are being hit by a lot of mail
    to users that do not exist on one
    particular domain. Incoming mail is handled
    by cyrus but is there a way I can reject all
    addresses not in the system with exim before
    it gets to cyrus. There are a lot of domains
    but this is happening to just
    one of them. I would like to avoid the freeze
    and error message cycle.

    Thanks,    bob      rvh@???