FEATURE(dnsbl)
Reject based on various DNS blacklists V8.10 and later
The original feature was called rbl and caused hosts
listed with the original “real-time blackhole list”
to be rejected. That feature has been deprecated and
replaced by this new FEATURE(dnsbl). With this new feature
you can have hosts rejected by any number of
real-time blackhole lists, including or excluding
the original. This feature is fully described in
FEATURE(dnsbl) on page 261.
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