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    (blak list) (n.) In Internet terminology, a generic name for a list of e-mail addresses or IP addresses that are originating with known spammers. Individuals and enterprises can use blacklists to filter out unwanted e-mails, as most e-mail applications today have filtering capabilities.

    Also referred to as a blackhole list, the blacklist also can include ISPs that allow known spammers to use their services. Compare with RBL, a blackhole list maintained by MAPS LLC.

    (v.) To place an email address or an IP address on a list of known spammers.