Yunes Tarada - PowerDMARC

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

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.

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.

Kit DKIM, DMARC, and SPF Setup Guide

Blog, ESP Alignment

Learn how to set up DKIM, DMARC, and SPF for Kit (ConvertKit) to improve email deliverability, prevent spoofing, and verify your setup.

NIST SP 800-81r3: DNS Security Guidelines for Email

Blog, Email Security

NIST published SP 800-81r3 in March 2026 — the first update to its DNS security guide in 13 years. Here's what the new guidance means for DNSSEC, protective DNS, and your DMARC, SPF, and DKIM setup.

How to Split a DKIM Record

Blog, DKIM

Running into a 255-character limit when adding your DKIM record? Learn how to split a DKIM TXT record into multiple strings the right way — step-by-step, with examples for Route 53, Google Cloud DNS, and more.

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

DMARC for Office 365 Setup Guide (2026)

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

Kit DKIM, DMARC, and SPF Setup Guide

NIST SP 800-81r3: DNS Security Guidelines for Email

How to Split a DKIM Record

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