---
title: "The Deliverability Handbook - Mini Guide"
url: "https://optimite.ai/downloads/the-deliverability-handbook-mini-guide"
type: "Free download"
format: "PDF"
category: "Email Deliverability"
published: "2026-06-16T13:58:01.679+00:00"
description: "This handbook covers the three authentication protocols (SPF, DKIM, DMARC), the exact complaint-rate thresholds that decide inbox vs. spam, the four list habits that quietly destroy sender reputation, and a step-by-step triage for when sends stop landing."
access: "Email-gated (free)"
publisher: "Optimite"
publisher_url: "https://optimite.ai"
---

# The Deliverability Handbook - Mini Guide

This handbook covers the three authentication protocols (SPF, DKIM, DMARC), the exact complaint-rate thresholds that decide inbox vs. spam, the four list habits that quietly destroy sender reputation, and a step-by-step triage for when sends stop landing.


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**How to get this download:** Visit [https://optimite.ai/downloads/the-deliverability-handbook-mini-guide](https://optimite.ai/downloads/the-deliverability-handbook-mini-guide) and submit your email. We'll send the pdf directly to your inbox (no newsletter spam).