RBL: /R-B-L/ Abbreviation: "Realtime Blackhole List". A service
that allows people to blacklist sites for emitting spam, and makes
the blacklist available in real time to electronic-mail transport
programs that know how to use RBL so they can filter out mail from
those sites. Drastic (and controversial) but effective. There is an
RBL home page (http://maps.vix.com/rbl/usage.html).
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