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/32s that sent spam to our known mail servers.

The second dnsbl, referred to as 'dul-dnsbl', will include entries for
/24s where the /32s are located, if said /32 does not pass a set of
heuristic tests designed to locate space of a dynamic nature.

=item B<Understands various forms of complex complaints>

When deployed in an address used by users to report spam, will attempt
to find the spam headers within attachments, possibly including
decoded uuencoded and base64 parts. Multiple header sets can be
analyzed in a single complaint, which will be archived separatedly.

=item B<Keeps an index of spam samples>

An external index, maintained with L<MLDBM>, L<Storable> and
L<DB_File>. This is very useful to quickly locate evidence related to
a given IP address.

=item B<Flexible whitelisting>