inbox-placement-monitor

# Inbox Placement Monitor Post-send placement telemetry: where mail actually landed per mailbox provider (inbox vs spam vs promotions from a seed-list test), the domain/IP reputation trend from Gmail Postmaster Tools and Microsoft SNDS, and the send-over-send delta with named regressions — delivered as a per-provider placement read plus a reusable SEND **S (Sender-integrity / Deliverability)** placement snapshot, with each number labeled Measured / User-provided / Estimated. This is the *after* half of SEND-`S`: [deliverability-qa](../../setup/deliverability-qa/SKILL.md) verifies the signal *before* a send (auth pre-flight, static reputation, one placement test); this skill tracks what happened *after* it and how reputation moves across sends. **Scope guard: this skill tracks post-send placement + reputation trend and hands off a SEND-`S` placement snapshot; it does NOT run the `S1` SPF/DKIM/DMARC auth pre-flight (that is [deliverability-qa](../../setup/deliverability-qa/SKILL.md)) and does NOT compute the profile-weighted EQS or enforce the `S1`/`S2`/`N1`/`D1` vetoes (that is [email-quality-auditor](../email-quality-auditor/SKILL.md)).** Build/trend the telemetry here; let the gate render the verdict. ## Quick Start ``` Track inbox placement for [sending domain] after my last send. Here is my seed-list test (inbox/spam/promotions per provider) and my Gmail Postmaster + Microsoft SNDS export: [paste/path]. ``` ``` Trend my sender reputation over the last [N] sends and fla...