I think he is wanting to have the Spamcop list local to his network instead of "reaching" across the 'Net.
Could be.
FWIW, though, only a small percentage of spam databases offer zone transfers of their data. Also, the zone transfers are only useful if you have a high enough rate of queries. For example, if the zone file is 50MB (some are!), and you update it just once a day (meaning that your data isn't as fresh as connecting directly), you would need to do over 100,000 lookups per day to justify the zone transfers (that's 100,000 non-cached lookups, so you could quite possibly process 1/4 million E-mails/day before the zone transfer is justified).
-Scott
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