Message-ID on free webmail but From is corporate (forgery)
message-id-freewebmail-mismatch
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-ID` header domain is a free webmail provider (gmail.com, yahoo.com, outlook.com, icloud.com, protonmail.com, etc.) while the `From` header domain is a corporate/branded domain. Shape: `From: support@paypal.com` with `Message-ID: <abc@gmail.com>`. Real branded senders never generate Message-IDs on free-webmail domains — their MTAs always stamp the sending-server domain. An attacker who crafts a spoofed From header but sends the email from a personal gmail mailbox leaves this fingerprint in the Message-ID that most MUAs never display. Precision rules prevent false positives on gmail-to-gmail legitimate forwards: the signal only fires when the From domain is NOT free webmail AND the Message-ID domain IS free webmail. Weighted at +5 — high-confidence forgery signal with essentially zero legitimate-use rate.
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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