---
title: "Playbook: stop burning cold email inboxes, and why placement tests lead | Changelog"
description: "A new playbook from a year of 300 Google Workspace inboxes run without deleting a domain: warm rotation with the daily cold and warmup mix on each side, copy…"
url: https://warminboxes.com/changelog/2026-11-11-stop-burning-inboxes
breadcrumb: "Home > Blog > Changelog > 11 November 2026"
---
Changelog

 11 November 2026

# Playbook: stop burning cold email inboxes, and why placement tests lead

A new playbook from a year of 300 Google Workspace inboxes run without deleting a domain: warm rotation with the daily cold and warmup mix on each side, copy and list rotation, routing, the recovery protocol and the warmup pool eleven months in. And a guide on monitoring: placement tests are the leading indicator, reply rates the lagging one.

## New

- The playbook: 300 inboxes, 12 months, no domain deleted, with the redacted inbox sheet and warmup panels behind it. [The playbook](https://warminboxes.com/playbooks/stop-burning-cold-email-inboxes)

- The guide: waiting for the reply rate to fall costs at least 48 hours of sending to spam; a placement test run properly catches a bad domain reputation and fingerprinted copy first. [The guide](https://warminboxes.com/blog/cold-email-deliverability-monitoring)

## For AI agents

- WarmInboxes Free MCP has a note on leading and lagging indicators, so an agent asks for a placement test before telling anyone to wait for replies. [WarmInboxes Free MCP](https://warminboxes.com/plugins/free-mcp)

[All entries →](https://warminboxes.com/changelog)