Sender Reputation Score (Concept Demo)

Real ISP reputation algorithms (Gmail's, Outlook's) are undisclosed and proprietary — nobody outside those companies knows the actual weights. What's public is the general shape, reflected in patents like the ones referenced below: combine complaint rate, bounce rate, engagement and volume-consistency signals into a composite score that predicts inbox placement before a message is even delivered. This demo uses a transparent, illustrative weighting (complaints hurt most, then bounces, then unsubscribes, with opens as a positive offset) to show the mechanism — read it as roughly: 80+ likely inbox, 50-79 mixed placement risk, below 50 high spam-folder risk. Do not treat the exact coefficients as real ISP behaviour.