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mailu/core/rspamd/conf/force_actions.conf

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rules {
ANTISPOOF_NOAUTH {
action = "reject";
expression = "!IS_LOCALLY_GENERATED & !MAILLIST & ((IS_LOCAL_DOMAIN_E & MISSING_FROM) | (IS_LOCAL_DOMAIN_H & (R_DKIM_NA & R_SPF_NA & DMARC_NA & ARC_NA)))";
message = "Rejected (anti-spoofing: noauth). Please setup DMARC with DKIM or SPF if you want to send emails from your domain from other servers.";
}
ANTISPOOF_DMARC_ENFORCE_LOCAL {
action = "reject";
expression = "!IS_LOCALLY_GENERATED & !MAILLIST & (IS_LOCAL_DOMAIN_H | IS_LOCAL_DOMAIN_E) & (DMARC_POLICY_SOFTFAIL | DMARC_POLICY_REJECT | DMARC_POLICY_QUARANTINE | DMARC_NA)";
message = "Rejected (anti-spoofing: DMARC compliance is enforced for local domains, regardless of the policy setting)";
}
ANTISPOOF_AUTH_FAILED {
action = "reject";
expression = "!IS_LOCALLY_GENERATED & !MAILLIST & BLACKLIST_ANTISPOOF";
message = "Rejected (anti-spoofing: auth-failed)";
}
}