On 2021-09-17 14:40, Christian Schmitz wrote:
DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=garena.com; q=dns/txt;
 s=mailo; t=1631836303; h=Content-Transfer-Encoding: Content-Type:
 MIME-Version: Message-ID: Date: Subject: To: From: Sender;

ifplugin Mail::SpamAssassin::Plugin::DKIM

    # full   __L_DKIM_VALID_TWITTER eval:check_dkim_valid(twitter.com)
    # header __L_FROM_TWITTER  From:addr =~ /[\@.]twitter\.com$/mi
    # meta   L_FAKE_TWITTER  __L_FROM_TWITTER && !__L_DKIM_VALID_TWITTER
    # score  L_FAKE_TWITTER  5

    # full   __L_DKIM_VALID_YAHOO_COM eval:check_dkim_valid(yahoo.com)
    # header __L_FROM_YAHOO_COM  From:addr =~ /[\@.]yahoo\.com$/mi
# meta L_FAKE_YAHOO_COM __L_FROM_YAHOO_COM && !__DOS_HAS_MAILING_LIST && !__L_DKIM_VALID_YAHOO_COM
    # describe L_FAKE_YAHOO_COM Meta: yahoo.com never send dkim unsigned
    # score  L_FAKE_YAHOO_COM  5

    full   __L_DKIM_VALID_GARENA_COM eval:check_dkim_valid(garena.com)
    header __L_FROM_GARENA_COM From:addr =~ /[\@.]garena\.com$/mi
meta L_GARENA_COM __L_FROM_GARENA_COM && !__DOS_HAS_MAILING_LIST && !__L_DKIM_VALID_GARENA_COM
    describe L_GARENA_COM Meta: garena known spam sender dkim domain
    score  L_GARENA_COM  5

endif

adj as needed

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