list of blocked IP addresses in a file?

Can this be done? The docs for 1.73 seem to indicate that it cannot. These
are all to be blocked for anti spam reasons but most have no PTR record
and while I could use a file of networks, this seems right now a little
OTT (although a nicely comented file would be great...).

Thanks

--
Alan Thew                                       alan.thew@???
Computing Services,University of Liverpool      Fax: +44 151 794-4442

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