Email Infrastructure Articles
Browse our email infrastructure articles for strategies, checklists, and practical guidance you can apply right away.
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Managing Multiple Email Accounts for Cold Email
Running cold email across multiple domains and inboxes is operationally complex. This guide covers the tools, systems, and workflows that keep everything organized, monitored, and healthy at scale.
Sending Limits & Scaling Cold Email Safely
Scaling cold email too fast is one of the most common ways to destroy a domain's reputation. Learn the exact numbers for safe daily limits, how to grow volume correctly, and the multi-account architecture that lets you scale without risk.
SPF, DKIM, and DMARC Explained Simply (+ Setup Guide)
SPF, DKIM, and DMARC are the three DNS records that prove your emails are legitimate. This guide explains what each one does, how to set them up, and how to verify they're working — without needing a technical background.
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Email Warm-Up: Why It Matters and How to Do It
A brand-new sending domain that jumps straight into cold email will get filtered or blacklisted fast. Learn exactly why email warm-up works, how to do it manually and with tools, and what a proper warm-up schedule looks like.
Setting Up Domains for Cold Email: Main vs. Secondary
Using your primary business domain for cold email is one of the riskiest things you can do. Learn how to set up secondary sending domains correctly — naming conventions, DNS configuration, inbox setup, and everything in between.
What Is Email Deliverability? The Complete Guide
Email deliverability is the difference between landing in the inbox and landing nowhere. This technical pillar breaks down every layer of the deliverability stack — from authentication to reputation to content — and maps out everything Phase 4 covers.