DNS & Network Guides
Plain-English explanations of DNS, email deliverability, SSL certificates, and network diagnostics — with direct links to the tools you need.
How-To Guides
Fix Common Problems
Actionable fixes for the most common DNS, email, and SSL issues.
Email
Why Is My Email Going to Spam?
SPF, DKIM, DMARC failures, blacklisted IPs, and spam score issues — what causes it and how to fix each one.
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SSL
How to Fix a Missing Intermediate Certificate
The most common SSL configuration error. How to identify it, why Chrome hides it, and how to fix it in nginx, Apache, and Caddy.
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DNS
DNS Change Not Propagating After 48 Hours
Why your DNS change still isn't showing up everywhere, and the step-by-step process to diagnose and fix it.
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Email
DMARC Fail — Causes and Fixes
Why your email is failing DMARC and exactly how to fix it without breaking legitimate mail flow.
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Email
550 5.7.1 Email Rejected — How to Fix
The 550 5.7.1 bounce means the receiving server actively rejected your email. Here's why and what to do.
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DNS
DNS_PROBE_FINISHED_NXDOMAIN — Causes & Fixes
Chrome's NXDOMAIN error explained. What causes it, how to tell if it's your DNS or the site, and how to fix it.
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Explainers
Understand the Fundamentals
DNS
What Is DNS TTL?
Time To Live explained — how long DNS records are cached, what values to use, and how it affects your migrations.
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Email
What Is an SPF Record?
SPF authorizes servers to send email for your domain. Learn how it works, what the syntax means, and how to set one up.
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Email
How to Set Up DMARC
DMARC protects your domain from email spoofing. Step-by-step setup from p=none monitoring to p=reject enforcement.
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Email
What Is DKIM?
DKIM adds a cryptographic signature to outgoing email. How it works, how to check it, and why it matters for deliverability.
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DNS
DNS Propagation Explained
Why DNS changes take time, how the caching hierarchy works, and how to minimize propagation time for your next migration.
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DNS
How to Lower TTL Before a DNS Migration
The exact playbook for changing TTL before a migration to keep propagation time under 5 minutes.
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Service Setup
DNS Records for Popular Services
Setup Guide
Google Workspace DNS Records
Complete DNS setup for Google Workspace (Gmail for business) — MX, SPF, DKIM, DMARC with copy-ready records.
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Setup Guide
Microsoft 365 DNS Records
Every DNS record you need for Microsoft 365 — MX, Autodiscover, SPF, DKIM, and verification records.
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Setup Guide
SendGrid DNS Records
Set up SendGrid domain authentication — CNAME records, DKIM, SPF, and bounce domain configuration.
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Setup Guide
Cloudflare DNS Setup
How to add your site to Cloudflare, set nameservers, configure A records and proxied subdomains.
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Setup Guide
Zoho Mail DNS Records
MX, SPF, and DKIM records for Zoho Mail with step-by-step setup instructions.
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Setup Guide
Mailchimp DNS Records
CNAME and SPF records for Mailchimp domain authentication and improved deliverability.
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