Blog

Practical guides to email authentication and domain security

Deep dives into DMARC, SPF, DKIM, and the infrastructure behind email delivery. Written for IT teams and MSPs who manage email for multiple domains.

Diagram showing how DMARC email authentication works between sender and receiver

April 2, 202610 min read

DMARC Explained: What It Is and How It Protects Your Domain

Learn what DMARC is, how it works with SPF and DKIM to prevent email spoofing, and how to set up a DMARC record for your domain.

Diagram showing SPF DNS lookup process and IP address verification

March 28, 20268 min read

A Deep Dive into SPF: How Sender Policy Framework Works

Understand SPF record syntax, the 10-DNS-lookup limit, how SPF handles third-party senders, and common mistakes that break email delivery.

Diagram showing DKIM signature verification with public and private keys

March 25, 20268 min read

DKIM: What It Is and How It Verifies Email Integrity

Learn how DKIM uses cryptographic signatures to verify that emails were not modified in transit and that they come from an authorized sender.

March 23, 20266 min read

How to Set Up DMARC for Google Workspace

Step-by-step guide to configuring SPF, DKIM, and DMARC for Google Workspace. Includes DNS records, common issues, and how to move from monitoring to enforcement.

March 22, 20267 min read

SPF "Too Many DNS Lookups": How to Fix It

The SPF 10-DNS-lookup limit causes email failures when exceeded. Learn what counts as a lookup, how to check your total, and five ways to fix it.