Zero-width char hidden inside subject keyword
subject-invisible-char-obfuscation
What this tier means
High-confidence threat indicator — phishing, impersonation, BEC, or scam pattern. Strong contributor to the trash decision.
How Gorganizer detects this
The subject line contains a zero-width or word-joiner character (U+200B ZWSP, U+200C ZWNJ, U+200D ZWJ, U+200E/F LTR/RTL marks, U+2060 word joiner, U+FEFF BOM) positioned between two ASCII letters. Subject-level sibling of the body zero-width obfuscation signal (iter 425). The attacker inserts an invisible char inside a scam keyword (`password reset`, `wire transfer`, `verify`) so that literal-string keyword filters and search indexes don't match while the rendered subject reads normally. The "between two ASCII letters" constraint prevents false positives on legitimate emoji ZWJ sequences, Arabic/Indic renderer glue, and stray BOMs — no legitimate English/Latin word ever has an invisible char between two ASCII letters. Weighted at +4 — higher than the body variant (+3) because the subject has essentially zero legitimate use of invisible chars and every subject character is deliberate.
False-positive guard
Every signal in Gorganizer feeds a multi-module score — never a sole verdict. This is a threat-tier signal — it adds a strong contribution to the trash score. The full pipeline still requires convergence across multiple modules + a margin over the safety floor before deletion happens, and Gmail's trash (30-day recovery) is always used — never permanent delete.
About the scoring engine
Gorganizer's scoring engine emits 2,143+ signals across six modules — headers, sender, subject, body, attachments, and structural metadata. Every email is scored by every module independently; the final verdict requires multiple modules to agree and the trash score to beat the safety floor by a margin.
Sacred safety guards — never delete starred emails, replies, calendar invites, receipts/invoices, or attachments — apply unconditionally regardless of any signal.
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