The Spam Prevention Early Warning System (SPEWS) was an anonymous service which maintained a list of IP address ranges belonging to Internet service providers (ISPs) which host spammers and show little action to prevent their abuse of other networks' resources. It could be used by Internet sites, as an additional source of information about the senders of unsolicited bulk email, better known as spam.
SPEWS is no longer active. A successor, the Anonymous Postmaster Early Warning System (APEWS), appeared in January 2007.
Read more about Spam Prevention Early Warning System: Overview, Process, Delisting
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