The "DROP" functions are "memoised" because the DROP list changes quite slowly.
There is no need to update cached data more than once per hour,
in fact once per day is more than enough in most cases. Automated downloads
must be at least one hour apart. Excessive downloads may result in your IP
being firewalled from the Spamhaus website.
If you are using them from
a long-running R session and need to fetch the list, use the this function
to clear the cache of all "DROP" get functions.
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