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=pod

=head1 Using Rspamd as a spam checker for Amavis

Amavis can use Rspamd as a spam checker, with Rspamd running either on
the same server or on a remote machine.

=head2 Example configuration #1 (local Rspamd)

  # Rspamd running on the same machine as Amavis. Default URL
  # is http://127.0.0.1:11333/checkv2 , matching Rspamd's
  # "normal" worker defaults.
  @spam_scanners = ( [
      'Local Rspamd', 'Amavis::SpamControl::RspamdClient',

      # Adjust scores according to Rspamd's "required score"
      # setting (defaults to 15). Scores reported by Rspamd
      # will be multiplied with this factor. The following
      # adjusts Rspamd scores to SpamAssassin scores. While
      # this setting is technically optional, not adjusting
      # scores is prone to cause headaches.
      score_factor => $sa_tag2_level_deflt / 15.0,

      # MTA name is used to assess validity of existing
      # Authentication-Results headers, e.g. if DKIM/DMARC
      # validation has already happened.
      mta_name => 'mail.example.com',
  ] );

=head2 Example configuration #2 (remote Rspamd)

  # Rspamd running behind HTTPS-capable proxy using basic
  # authentication to control access.
  @spam_scanners = ( [
      'Remote Rspamd', 'Amavis::SpamControl::RspamdClient',
      url => 'https://rspamd-proxy.example.com/checkv2',

      # Response timeout in seconds. Default is 60, matching
      # Rspamd's standard config for the "normal" worker.
      timeout => 42,

      # SSL-options and -credentials passed to LWP::UserAgent,
      # see https://metacpan.org/pod/LWP::UserAgent . Default:
      # ssl_opts => { verify_hostname => 1 },
      credentials => {
          # The following <host>:<port> must match the 'url'
          # defined above or credentials won't be transmitted.
          netloc => 'rspamd-proxy.example.com:443',
          # Remote authentication realm
          realm => 'Rspamd restricted access',
          username => 'Marco',
          password => 'Polo',
      },

      # Don't scan messages remotely if the body size extends
      # the following limit (optional setting).
      mail_body_size_limit => 32 * 1024,

      score_factor => $sa_tag2_level_deflt / 15.0,
      mta_name => 'mail.example.com',
  ] );

=head2 Requirements

In addition to Amavis' core requirements, this extension needs
the following additional Perl modules:

  JSON
  HTTP::Message
  LWP::UserAgent
  LWP::Protocol::https
  Net::SSLeay

Should your host OS not provide the necessary packages, these
modules can be obtained via https://www.cpan.org .

=cut

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