I'm not sure what the discussion about zone transfers is all about. I
don't think many DNSBLS support real DNS zone transfers anymore.
Until recently, MAPS distributed its DNSBLs by AXFR and IXFR. If you
happen to have a DNS server that does IXFR, it's not a bad way to do
DNS updates. If you don't (like me), AXFR is dreadful.
MAPS recently changed their setup and now tell me just to query their
servers via a long name that includes a hash of my account number,
which I do via a funky local cache that reformats the data on the fly
into something easier for my mail servers to use. I don't know of
anyone who distributes DNSBLs other than by rsync or FTP of files of
CIDR ranges.
R's,
John
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