Precedence: bulk/list from a free-webmail sender — spammer using mailing-list classification without real mailer infrastructure
precedence-bulk-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 sets `Precedence: bulk` or `Precedence: list` — a legitimate bulk-mail / mailing-list marker used by newsletter platforms and RFC 2076 auto-responders — BUT the From address is on a free webmail domain (gmail.com, outlook.com, yahoo.com, protonmail.com, etc.). Companion to the iter 407 `list-id-from-free-webmail` signal targeting the same attacker fingerprint via a different header. Legitimate bulk mail always runs from dedicated mailer infrastructure on a business domain — SendGrid, Mailchimp, custom corporate domains. The combination of a bulk-classification header and a personal webmail sender means a spammer set `Precedence: bulk` hoping the classification makes their email route through filters less aggressively, but they can't afford the overhead of a real corporate domain. Weighted at +3 — stacks on top of the existing +2 `precedence-*` signal for a total of +5 on this shape.
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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