{"success":true,"data":{"id":"subject-trademark-swarm","label":"Subject clusters 2+ ® or ™ symbols — fake-official spam pattern","description":"The subject line clusters two or more trademark symbols (® U+00AE, ™ U+2122, ℠ U+2120) — e.g. `Microsoft® Security® Alert™` or `Amazon™ Prime® Member®`. Spam pattern: attacker mimics legal-notice conventions to look \"official\" and increase open rates. Legitimate brand mail uses at most one trademark symbol per subject (and usually zero — the brand name alone is enough, and legal-notice ® is a contract-doc convention that doesn't belong in conversational marketing headers). The copyright symbol © (U+00A9) is deliberately NOT in the detection set because a subject like `© 2026 Company — newsletter` is a legitimate footer-style attribution. Weighted at +2, modest, combines with other marketing signals rather than solo-triggering.","tier":"warning","category":"subject","isThin":false}}