
SPF, DKIM, and DMARC: The Complete Email Authentication Guide
Email spoofing costs businesses billions every year. Learn how SPF, DKIM, and DMARC work together to protect your domain from phishing — with DNS record examples you can copy.
ZeriFlow Journal
Actionable articles on TLS, headers, CSP, privacy, and practical hardening for modern web apps.
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Email spoofing costs businesses billions every year. Learn how SPF, DKIM, and DMARC work together to protect your domain from phishing — with DNS record examples you can copy.

HTTP security headers are your website's first line of defense. Learn what CSP, HSTS, X-Frame-Options, and other headers do — and how to configure them correctly.
Launching a website without a security review is like leaving your front door open. Use this 20-point checklist to catch vulnerabilities before attackers do.
Still running TLS 1.0? Your SSL rating affects SEO, user trust, and compliance. This guide walks you through achieving an A+ rating step by step.
Move security from random heroics to a predictable weekly system your team can actually sustain.
If you run a small or medium business, these are the controls that reduce risk quickly without enterprise complexity.
A practical, low-friction sprint to reduce real risk without slowing down product momentum.