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#### 9.17.6.5 Blackholes

Variable: spam-use-blackholes

  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 The current list is fairly comprehensive, but make sure to let us know if it contains outdated servers.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.

Variable: spam-blackhole-servers

  The list of servers to consult for blackhole checks.

Variable: spam-blackhole-good-server-regex

  A regular expression for IPs that should not be checked against the blackhole server list. When set to `nil`, it has no effect.

Variable: spam-use-dig

  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.