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This option is disabled by default. You can let Gnus
consult the blackhole-type distributed spam processing
systems (DCC, for instance) when you set this option. The
variable spam-blackhole-servers holds the list
of blackhole servers Gnus will consult. The current list is
fairly comprehensive, but make sure to let us know if it
contains outdated servers.
The blackhole check uses the dig.el package,
but you can tell spam.el to use
dns.el instead for better performance if you set
spam-use-dig to nil. It is not
recommended at this time to set spam-use-dig to
nil despite the possible performance
improvements, because some users may be unable to use it, but
you can try it and see if it works for you.
The list of servers to consult for blackhole checks.
A regular expression for IPs that should not be checked
against the blackhole server list. When set to
nil, it has no effect.
Use the dig.el package instead of the
dns.el package. The default setting of
t is recommended.
Blackhole checks are done only on incoming mail. There is no spam or ham processor for blackholes.