[Exim] Spam blacklist

Hi all, like most of you on this list we use the holy trinity of
exim/exiscan/spamassassin. There seems to have been a lot of discussion
of RBL sites going down and new ones coming up. Is there any consensus
of opinion on which are the best free RBL sites to use.

Regards

Ron

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Ron McKeating
Senior IT Services Specialist
Internet Services and Software Solutions
Loughborough University
01509 222329