How to read email headers (SPF, DKIM, and DMARC)
Ever opened an email header and had no idea what was going on? This quick guide will give you the know-how you need to understand.
Do I need to receive DMARC emails? Why they’re crucial
Why do I need to receive all these DMARC emails? Find out why your inbox is flooded with valuable DMARC reports and discover an easier way to parse through them.
What is a watering hole attack (and how to prevent it)
Learn everything you need to know about watering hole attacks to prevent them and protect your organization and its customers.
What is SPF flattening and why doesn’t it work?
Learn why manually flattening SPF records creates more issues and how automated, real-time SPF solves the 10‑lookup limit once and for all.
What is a whaling attack in cybersecurity and how to stop it
Learn the ins and outs of whaling attacks, how they work, who they tend to target, and best practices to prevent them.
DMARC failure reports: Everything you need to know in 2025
Explore the distinctions between DMARC failure and aggregate reports. Learn why aggregate reports are preferred for effective email authentication and security.
What is email impersonation (and how to prevent it in 2025)?
Email impersonation attacks are evolving. Learn how to implement DMARC, DKIM, and SPF to protect your domain from being weaponized against customers.
How to detect if Microsoft is rejecting your emails (and why)
Learn how to detect if Microsoft is rejecting your emails due to new authentication rules—and how solutions like Valimail Monitor can help you fix it.
The best DMARC report analyzer tools in 2026
Discover the best DMARC report analyzer tools to help you monitor, interpret, and improve your domain’s email authentication and boost phishing protection.
Why is my email not sending? (and the solution)
Fortunately, there’s bound to be a reason for your email not sending, and when there’s a reason, there’s usually a solution. We’re here to help you find answers.
Introducing the Valimail Domain Executive Report
Easily showcase email security progress with Valimail’s Domain Executive Report—track DMARC status, sender authentication, and threats in a shareable format.
What is a tailgating attack (and how to prevent it)
Explore real-life examples and preventive strategies to help you recognize and deter tailgating attacks from threatening your business, employees, and customers.