NAME

       Mail::SpamAssassin::Plugin::DCC - perform DCC check of messages

SYNOPSIS

         loadplugin Mail::SpamAssassin::Plugin::DCC

         full DCC_CHECK        eval:check_dcc()
         full DCC_CHECK_50_79  eval:check_dcc_reputation_range('50','79')

DESCRIPTION

       The DCC or Distributed Checksum Clearinghouse is a system of servers collecting and
       counting checksums of millions of mail messages.  The counts can be used by SpamAssassin
       to detect and filter spam.

       See https://www.dcc-servers.net/dcc/ for more information about DCC.

       Note that DCC is disabled by default in "v310.pre" because its use requires software that
       is not distributed with SpamAssassin and that has license restrictions for certain
       commercial uses.  See the DCC license at https://www.dcc-servers.net/dcc/LICENSE for
       details.

       Enable it by uncommenting the "loadplugin Mail::SpamAssassin::Plugin::DCC"
       confdir/v310.pre or by adding this line to your local.pre.  It might also be necessary to
       install a DCC package, port, rpm, or equivalent from your operating system distributor or
       a tarball from the primary DCC source at https://www.dcc-servers.net/dcc/#download See
       also https://www.dcc-servers.net/dcc/INSTALL.html

TAGS

       The following tags are added to the set, available for use in reports, header fields,
       other plugins, etc.:

         _DCCB_    DCC server ID in X-DCC-*-Metrics header field name
         _DCCR_    X-DCC-*-Metrics header field body
         _DCCREP_  DCC Reputation or percent bulk mail (0..100) from
                     commercial DCC software

USER OPTIONS

       use_dcc (0|1)       (default: 1)
           Whether to use DCC, if it is available.

       use_dcc_rep (0|1)        (default: 1)
           Whether to use the commercial DCC Reputation feature, if it is available.  Note that
           reputation data is free for all starting from DCC 2.x version, where it's
           automatically used.

       dcc_body_max NUMBER
       dcc_fuz1_max NUMBER
       dcc_fuz2_max NUMBER
           Sets how often a message's body/fuz1/fuz2 checksum must have been reported to the DCC
           server before SpamAssassin will consider the DCC check hit.  999999 is DCC's MANY
           count.

           The default is 999999 for all these options.

       dcc_rep_percent NUMBER
           Only the commercial DCC software provides DCC Reputations (but starting from DCC 2.x
           version it is available for all).  A DCC Reputation is the percentage of bulk mail
           received from the last untrusted relay in the path taken by a mail message as measured
           by all commercial DCC installations.  See http://www.rhyolite.com/dcc/reputations.html
           You "must" whitelist your trusted relays or MX servers with MX or MXDCC lines in
           /var/dcc/whiteclnt as described in the main DCC man page to avoid seeing your own MX
           servers as sources of bulk mail.  See
           https://www.dcc-servers.net/dcc/dcc-tree/dcc.html#White-and-Blacklists The default is
           90.

ADMINISTRATOR OPTIONS

       dcc_timeout n       (default: 5)
           How many seconds you wait for DCC to complete, before scanning continues without the
           DCC results. A numeric value is optionally suffixed by a time unit (s, m, h, d, w,
           indicating seconds (default), minutes, hours, days, weeks).

       dcc_home STRING
           This option tells SpamAssassin where to find the dcc homedir.  If not specified, try
           to use the locally configured directory from the "cdcc homedir" command.  Try /var/dcc
           if that command fails.

       dcc_dccifd_path STRING
           This option tells SpamAssassin where to find the dccifd socket instead of a local Unix
           socket named "dccifd" in the "dcc_home" directory.  If a socket is specified or found,
           use it instead of "dccproc".

           If specified, "dcc_dccifd_path" is the absolute path of local Unix socket or an INET
           socket specified as "[Host]:Port" or "Host:Port".  Host can be an IPv4 or IPv6 address
           or a host name Port is a TCP port number. The brackets are required for an IPv6
           address.

           The default is "undef".

       dcc_path STRING
           Where to find the "dccproc" client program instead of relying on SpamAssassin to find
           it in the current PATH or "dcc_home/bin". This must often be set, because the current
           PATH is cleared by taint mode in the Perl interpreter,

           If a "dccifd" socket is found in "dcc_home" or specified explicitly with
           "dcc_dccifd_path", use the dccifd(8) interface instead of "dccproc".

           The default is "undef".

       dcc_options options
           Specify additional options to the dccproc(8) command.  Only characters in the range
           [0-9A-Za-z ,._/-] are allowed for security reasons.

           The default is "undef".

       dccifd_options options
           Specify additional options to send to the dccifd daemon with the ASCII protocol
           described on the dccifd(8) man page.  Only characters in the range [0-9A-Za-z ,._/-]
           are allowed for security reasons.

           The default is "undef".

       dcc_learn_score n        (default: undef)
           Report messages with total scores this much larger than the SpamAssassin spam
           threshold to DCC as spam.