Yunes Tarada - PowerDMARC

What Is SPF Include? How to Use It Safely in Your SPF Record

The SPF include mechanism lets you authorize third-party senders in your SPF record. This guide covers DNS lookup limits and how to keep your record valid.

Dangling DNS Records: What They Are and How to Prevent Subdomain Takeover

Blog

Prevent dangling DNS records to stop domain/subdomain takeover attacks today. Free dangling DNS detection tool.

SPF flattening: What is it and why do you need it?

Blog, Email Security

SPF flattening is a technique used to optimize and simplify Sender Policy Framework (SPF) records by reducing the number of DNS lookups.

DMARC for Office 365 Setup Guide (2026)

DMARC, Blog

Step-by-step guide to setting up DMARC for Office 365 / Microsoft 365. Covers custom domains, onmicrosoft.com, inbound enforcement, and why M365 alone isn't enough.

DKIM2 Explained: What It Changes and Where the Standard Stands

Blog

DKIM2 is the proposed successor to DKIM, now an active IETF working group draft. See what it changes, its current status, and what senders should do.

How to Fix “DKIM Signature Is Not Valid” and “Body Hash Not Verified” Errors

Blog

The “DKIM signature not valid” error can occur due to an incorrect entry in the DKIM DNS record.