Residential-IP sender claiming corporate auth posture
sender-ip-residential-claim-corporate
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 connecting IPv4 sender address is OUTSIDE the known datacenter/hosting-provider prefix list (DigitalOcean, Linode, Hetzner, OVH, Vultr) — i.e., it looks like a residential ISP or compromised endpoint — while the sender domain claims a corporate authentication posture (Authentication-Results references both spf= and dkim= mechanisms). This shape indicates either a hijacked residential endpoint sending phishing through a home connection, or a distributed proxy network using compromised consumer routers. Free-webmail senders (gmail, outlook, yahoo, icloud) and BRAND_TRUST_MAP brands are skipped because they legitimately span outside the small static datacenter prefix list.
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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