---
title: "Cold Email Bible | MailDeck"
description: "The MailDeck Cold Email Bible - a structured walkthrough of high-volume cold email infrastructure: stack design, deliverability protocols, and scaling rules."
canonical: "https://maildeck.co/guideline"
last-updated: "2026-08-22"
---

> The MailDeck Cold Email Bible - a structured walkthrough of high-volume cold email infrastructure: stack design, deliverability protocols, and scaling rules.

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Scaling Room × Maildeck - Definitive 2026 Edition

# The Cold Email Bible

Three sections. One complete system. Everything you need to flood your calendar without burning a single inbox.

4

Inbox Types Ranked

6-10%

Target Reply Rate

500+

Calls/Month Blueprint

Part 01

Inbox Types & Infrastructure - The Authoritative Reference

Foundation

## The Golden Rule

⚡ Non-Negotiable

Deliverability is determined by your inbox type, domain health, and copy quality. Not your sequencer. Not your "exclusive infrastructure." Not your warmup tool brand. Your sequencer is a scheduler. This section overwrites everything else on sends, warmup, and inbox types.

The Master Reference

## All Four Inbox Types

Every tool, provider, and reseller is selling you one of these four. Know exactly what you're buying before you spend a dollar.

| Provider | Rank | Price / Inbox | Inboxes / Domain | Cost / Inbox | Cold Sends / Day |
|---|---|---|---|---|---|
| Google Workspace | #1 Best | $2.99/inbox | 5 | $2.99 | 18–22 |
| Outlook Premium | #2 Excellent | $40/domain | 100 | $0.40 | 8–10 |
| Outlook Normal | #3 Good | $30/domain | 100 | $0.30 | 3–5 |
| Private SMTP | #4 Variable | $0.50/inbox | 5 | $0.50 | 11–14 |

### Provider Deep-Dives

### The Diversification Stack - 50/30/20 Ratio

### Sending Volume Per Domain

Here is the exact math for how many domains you need to reach your target volume safely. Never exceed these limits.

Table with columns: Provider, Sends/Day/Inbox, Inboxes/Domain, Sends/Month/Domain - no rows are published on this page.

### Become a Maildeck client to unlock the full Bible

This guide is exclusive to our active users. Get access to the complete 500+ calls/month blueprint, interactive volume calculator, and advanced deliverability frameworks.

View Pricing & Get Access

Interactive Calculator

500 Calls/Mo System

Warmup Blueprints

© Scaling Room - All rights reserved. Internal Document Ref: MD-BIBLE-2026