SPF, DKIM, DMARC: Why Emails Land in Spam Without Them

SPF, DKIM, and DMARC are three separate, complementary DNS-based standards that together answer the question every major mailbox provider now asks of every incoming message before deciding whether it belongs in the inbox or the spam folder: can this message's…

The “Bad Neighbor” Problem: Shared Hosting IP Reputation Risk Beyond Email

The "bad neighbor" effect on shared hosting is most commonly discussed specifically in the context of email deliverability and spam blocklisting, covered in depth elsewhere on this blog — but the same underlying dynamic, a shared resource carrying a collective…

Why Backups Without a Restore Test Aren’t Really Backups

A backup that has never actually been restored and verified is, in a genuinely meaningful sense, not yet a confirmed backup at all — it's an untested assumption that happens to look reassuring on a dashboard reporting nightly "success" messages.…

What Happens Technically When a Website “Goes Down”

"The website is down" is a description of what a visitor experiences, not a diagnosis of what's actually happening technically — and the phrase covers a genuinely wide range of distinct underlying failure modes, each with a different cause, a…

Reverse DNS (rDNS): Why It Matters for Email Deliverability

Most DNS discussion focuses on forward resolution — looking up a domain name to find its IP address — but the reverse direction, looking up an IP address to find its associated hostname, plays a specific, often overlooked role in…

Why Brute-Force Login Attempts Never Really Stop, and How Rate Limiting Helps

Almost every internet-facing website with a login page — WordPress's wp-login.php being an especially common, specifically targeted example — receives a constant, unrelenting stream of automated login attempts, every single day, regardless of the site's size, popularity, or perceived importance.…

What a WAF Actually Blocks — and What Slips Straight Through

A Web Application Firewall sits between incoming traffic and a web application, inspecting requests for known attack patterns before they ever reach the actual application code — a genuinely valuable security layer, and one that's frequently oversold or misunderstood as…

The Hidden Limits of “DDoS Protection” Plans

"DDoS protection included" has become a near-universal marketing bullet point across hosting plans, VPS providers, and CDN services, and while the underlying protection is often genuinely real and valuable, the word "included" frequently obscures meaningful limits on exactly what kind…

Why Latency Depends More on Server Location Than Server Power

A common, understandable instinct when a website feels slow for visitors in a specific region is to assume the server itself needs more resources — more CPU, more RAM, a faster disk. For a specific, common category of slowness, this…

CDN Edge Caching: Why a “Fast” Site Can Still Serve Stale Content

Content Delivery Networks dramatically speed up websites by caching content at edge locations distributed close to visitors around the world — but this exact mechanism that makes CDNs fast is also precisely why a content update can seem to work…