lookup methods

    I wonder if there any plans of extending exim file lookup
    methods to include NIS/NIS+ searches.  On big sites (>10,000 users)
    distributed mail-related information usually spans more than
    one host, making dbm diles inadequate, let alone plain text.

    Something like:

local_domains = \
                lsearch;/etc/exim/strict-domains:\
        nisplus;domains.mail.local.org_dir

    and

    ${lookup {$domain:type} nisplus {domains.mail.local.org_dir} {$value}

    Ilya