RBL /R-B-L/ Abbreviation: "Realtime Blackhole List".

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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.

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