Need to test this:

  my $config = {
    'DShield'   => 'tmp/DShield.cache', # path/to/file
    'UserID'    => '0',                 # DShield UserID
    'To'        => 'test@dshield.org',  # or report@dshield.org
    'From'      => 'john.doe@foo.com',
    'Reply-To'  => 'john.doe@foo.com',  # optional
  # optional
    'Obfuscate' => 'complete or partial',
  # either one or more working SMTP server's
    'smtp'      => 'iceman.dshield.org,mail.euclidian.com',
  # or a sendmail compatible mail transport command
    'sendmail'  => '/usr/lib/sendmail -t -oi',
  };

  order is:

        UserID
        DShield
        To
        From
        Reply-To
        smtp
        sendmail
        Obfuscate