List-Id header + free-webmail From — fake mailing list on Gmail/Outlook/Yahoo
list-id-from-free-webmail
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 message has a `List-Id` header (RFC 2919 — set by mailing list managers like Mailman, Google Groups, Amazon SES, Mailchimp, etc.) AND the From address is on a free webmail domain (gmail.com, outlook.com, yahoo.com, protonmail.com, etc.). This combo is an attacker fingerprint: legitimate mailing lists always run on dedicated mailer infrastructure with custom domains, never from personal webmail accounts. A free-webmail user "hosting a newsletter" via the List-Id header is almost universally a spam blaster trying to borrow mailing-list legitimacy. Weighted at +4 — a strong structural signal but not a decisive single-shot delete, because a misconfigured Google Groups owner could theoretically produce the shape legitimately.
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 over 1,800 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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