[Exim] rbl servers and domain list files

Hi,

Is it possible to get rbl_domains to read config from an external
host list?

I have tried many combinations of host lists (with and without
reg expressions) and a similar number of lsearch list
combinations without success. In particular, I am wanting to use
the following combination:

relays.ordb.org/warn
blackholes.mail-abuse.org/reject
dialups.mail-abuse.org/warn
relays.mail-abuse.org/warn

I am calling this file /etc/exim-rbl-servers

I have also tried the following lsearch format:

relays.ordb.org/warn:
blackholes.mail-abuse.org/reject:
dialups.mail-abuse.org/warn:
relays.mail-abuse.org/warn:

And 20 or so combinations of the above.

Is this possible?

ps - there are political motivations elsewhere in a client's
organisation for wanting to do this, so please don't shoot the
messenger as to why you would do it this way

Thanks,

Darren Mackay