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Drag Rises With Speed Squared: The Real Cost of 130 km/h
Reverse DNS and Email Deliverability: Why Your PTR Record Silently Matters
A missing PTR record silently degrades email deliverability. Here's how forward-confirmed reverse DNS works, why it matters for email authentication, who controls PTR records, and how reverse DNS is used in security investigation.
BIMI Setup Guide: How Email Logo Authentication Fits Into the Full Stack
BIMI is the capstone of email authentication — but it requires SPF, DKIM, and DMARC at p=reject to function. Here's the full setup guide, what Verified Mark Certificates are, which inboxes support it, and the most common misconfigurations.
DMARC Deployment: How to Move from p=none to p=reject Without Breaking Email
Most DMARC records are at p=none — monitoring mode with no actual protection. Here's the safe four-phase path from p=none to p=reject, how to read aggregate reports, the February 2024 Google/Yahoo requirements, and common mistakes.
MX Records and Email Delivery Failures: How to Diagnose and Fix Them
When email stops working, MX records are almost always part of the diagnosis. Here's how MX records control email delivery, how to debug bounces and delivery failures, common provider configurations, and the null MX for non-email domains.
How to Get Removed from Email Blacklists: Spamhaus, Barracuda & More
Getting blacklisted is fast; getting off takes knowing which list you're on and following the right delisting process for each. Here's the major blacklists explained, what causes listings, and how to remove your IP or domain from each one.
HTTP Security Headers: What Most Sites Are Missing and How to Fix It
Security headers most sites are missing, what HSTS, CSP, and X-Frame-Options actually prevent, how Cache-Control directives work, and which headers reveal server information you should hide in production.
Why BMI Is Flawed — And What to Use Alongside It
BMI is a useful population-level tool that's routinely misapplied to individuals. Here's what it genuinely measures, where it fails, and which complementary measures give a more accurate picture of metabolic health.
DKIM Key Rotation, Multiple Selectors, and Debugging Silent Failures
DKIM breaks silently and the symptoms look like spam problems. Here's key rotation without disruption, why DKIM alignment matters for DMARC, multiple selectors for multiple sending sources, and how to debug the most common failure modes.
How Much Water Do You Actually Need? The 8-Glasses Rule Examined
The 8-glasses-a-day rule has almost no scientific basis. Here's how the body actually regulates hydration, what genuinely affects your water needs, how to use urine colour as a real-time indicator, and when the rule breaks down.
UUID v1, v4, v5, v7 Compared — Which Version Should You Actually Use?
UUID v1, v3, v4, v5, and v7 all work differently and suit different use cases. Here's when to use each — including why v7 is now the recommended choice for database primary keys.
Biological Age vs. Chronological Age: Why Your Birthday Isn't the Whole Story
Your birthday tells you how long you've been alive — not how old your body actually is. Biological age can be years younger or older than your chronological age, and unlike your birth date, it responds to what you do.
DNS Propagation Explained: Why the 48-Hour Wait Is Mostly Avoidable
DNS propagation isn't magic — it's cache expiry. Understanding how TTL, authoritative nameservers, and recursive resolvers interact makes domain migrations predictable and the 48-hour wait mostly avoidable.
