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=head1 NAME
PublicInbox::SaPlugin::ListMirror - SpamAssassin plugin for mailing list mirrors
=head1 SYNOPSIS
loadplugin PublicInbox::SaPlugin::ListMirror
Declare some mailing lists based on the expected List-Id value,
expected servers, and mailing list address:
list_mirror List-Id <foo.example.com> *.example.com foo@example.com
list_mirror List-Id <bar.example.com> *.example.com bar@example.com
Bump the score for messages which come from unexpected servers:
header LIST_MIRROR_RECEIVED eval:check_list_mirror_received()
describe LIST_MIRROR_RECEIVED Received does not match expected
score LIST_MIRROR_RECEIVED 10
Bump the score for messages which Bcc the list:
header LIST_MIRROR_BCC eval:check_list_mirror_bcc()
describe LIST_MIRROR_BCC Mailing list was Bcc-ed
score LIST_MIRROR_BCC 5
=head1 DESCRIPTION
This plugin contains common functions to provide accurate, ongoing
mirrors of existing mailing lists. It may be used independently of the
rest of public-inbox, it does not depend on any public-inbox code, only
SpamAssassin.
=head1 ADMINISTRATOR SETTINGS
This plugin has no administrator settings, aside from the need
to load it via C<loadplugin> and enabling user rules
C<allow_user_rules 1>
=head1 USER SETTINGS
=over 4
=item list_mirror HEADER HEADER_VALUE HOSTNAME_GLOB [LIST_ADDRESS]
Declare a list based on an expected C<HEADER> matching C<HEADER_NAME>
exactly coming from C<HOSTNAME_GLOB>. C<LIST_ADDRESS> is optional,
but may specify the address of the mailing list being mirrored.
C<List-Id> or C<X-Mailing-List> are common values of C<HEADER>
An example of C<HEADER_VALUE> is C<E<lt>foo.example.orgE<gt>>
if C<HEADER> is C<List-Id>.
C<HOSTNAME_GLOB> may be a wildcard match for machines where mail can
come from or an exact match.
C<LIST_ADDRESS> is only required if using the L</check_list_mirror_bcc>
eval rule
C<list_mirror> may be specified multiple times.
=back
=head1 EVAL FUNCTIONS
=over 4
=item header LIST_MIRROR_RECEIVED eval:check_list_mirror_received()
The C<check_list_mirror_received> function implements C<Received:>
header checking based on L</list_mirror> configuration values.
This rule can be used to score and prevent messages from being injected
directly into your mirror without going through the expected mailing
list servers:
ifplugin PublicInbox::SaPlugin::ListMirror
header LIST_MIRROR_RECEIVED eval:check_list_mirror_received()
describe LIST_MIRROR_RECEIVED Received does not match expected
endif
=item header LIST_MIRROR_BCC eval:check_list_mirror_bcc()
The C<check_list_mirror_bcc> function checks for Bcc to mailing lists
declared with a C<LIST_ADDRESS> via L</list_mirror>
Spammers will often Bcc mailing lists; while it's uncommon and
strange for valid messages to be Bcc-ed to any public mailing list.
This rule allows users to assign a score to Bcc-ed messages
ifplugin PublicInbox::SaPlugin::ListMirror
header LIST_MIRROR_BCC eval:check_list_mirror_bcc()
describe LIST_MIRROR_BCC Mailing list was Bcc-ed
endif
=back
=head1 CONTACT
Feedback welcome via plain-text mail to L<mailto:meta@public-inbox.org>
The mail archives are hosted at L<https://public-inbox.org/meta/>
and L<http://4uok3hntl7oi7b4uf4rtfwefqeexfzil2w6kgk2jn5z2f764irre7byd.onion/meta/>
=head1 COPYRIGHT
Copyright (C) 2016-2021 all contributors L<mailto:meta@public-inbox.org>
License: AGPL-3.0+ L<http://www.gnu.org/licenses/agpl-3.0.txt>
=head1 SEE ALSO
L<Mail::SpamAssassin::Conf>
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