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Net::DNSBL::MultiDaemon is the Perl module that implements the multi_dnsbl
daemon.
multi_dnsbl is a DNS emulator daemon that increases the efficacy of DNSBL
look-ups in a mail system. multi_dnsbl may be used as a stand-alone DNSBL or as
a plug-in for a standard BIND 9 installation. multi_dnsbl shares a common
configuration file format with the Mail::SpamCannibal sc_BLcheck.pl script so
that DNSBL's can be maintained in a common configuration file for an entire
mail installation.
Because DNSBL usefulness is dependent on the nature and source of spam sent to
a specific site and because sometimes DNSBL's may provide intermittant service,
multi_dnsbl interrogates them sorted in the order of greatest successful hits.
DNSBL's that do not respond within the configured timeout period are not
interrogated at all after 6 consecutive failures, and thereafter will be
retried not more often than once every hour until they come back online. This
eliminates the need to place DNSBL's in a particular order in your MTA's config
file or periodically monitor the DNSBL statistics and/or update the MTA config
file.
WWW: https://metacpan.org/release/Net-DNSBL-MultiDaemon
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