Found in a Nov. 1 posting to the SpamCop discussion list:

 SpamCop now implements "pre-emptive" blocking of hosts. This is based on
 non-SUBE points (mail volume) alone, and is not related to complaints. If
 a host has no mail volume within the past 7 days except for a 1 day or
 less period where it does show volume, it will be listed. For example, a
 host which has no more than 24 hours history for sending mail will be
 listed under the assumption that it is most likely a new source of spam
 (since the great majority of new sources of email are sources of spam).
 After 24 hours, we hope that users will have had a chance to report spam
 from the new host - or not. If they do, then the other rules will list
 the host. If they don't (and the host keeps sending mail), then it will
 drop off the blacklist.

Follow-ups have already raised issues such as "What if an ISP brings a new
mail server on line?"

Thread begins at
http://news.spamcop.net/pipermail/spamcop-list/2003-November/062487.html



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