How Email Works: SMTP, IMAP, SPF, DKIM, and DMARC Explained
Email is older than the web and was built to trust everyone. Follow a message from outbox to inbox through SMTP, MX records and IMAP, then s...
Oct 20, 2026
![First Post](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><linearGradient id="gFirst" x1="0%" y1="0%" x2="100%" y2="100%"><stop offset="0%" stop-color="%238b5cf6" /><stop offset="100%" stop-color="%23ec4899" /></linearGradient><filter id="fFirst"><feDropShadow dx="0" dy="2" stdDeviation="3" flood-opacity="0.3"/></filter></defs><circle cx="50" cy="50" r="45" fill="url(%23gFirst)" filter="url(%23fFirst)"/><circle cx="50" cy="50" r="38" fill="none" stroke="rgba(255,255,255,0.4)" stroke-width="2"/><path d="M60 30 C 50 30, 40 40, 35 55 L 30 70 L 45 65 C 60 60, 70 50, 70 40 C 70 35, 65 30, 60 30 Z" fill="%23ffffff" opacity="0.9"/><path d="M35 55 L 45 65" stroke="%23ec4899" stroke-width="2"/><circle cx="65" cy="25" r="3" fill="%23fef08a"/><path d="M65 15 L65 20 M65 30 L65 35 M55 25 L60 25 M70 25 L75 25" stroke="%23fef08a" stroke-width="2" stroke-linecap="round"/></svg>)
![Word Warrior](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><linearGradient id="gWord" x1="0%" y1="0%" x2="100%" y2="100%"><stop offset="0%" stop-color="%23b91c1c" /><stop offset="100%" stop-color="%23f87171" /></linearGradient><filter id="fWord"><feDropShadow dx="0" dy="2" stdDeviation="3" flood-opacity="0.3"/></filter></defs><circle cx="50" cy="50" r="45" fill="url(%23gWord)" filter="url(%23fWord)"/><circle cx="50" cy="50" r="38" fill="none" stroke="rgba(255,255,255,0.4)" stroke-width="2"/><path d="M25 60 L75 60 L70 75 L30 75 Z" fill="%23ffffff" opacity="0.9"/><path d="M50 20 L55 30 L55 70 L45 70 L45 30 Z" fill="%23ffffff" filter="url(%23fWord)"/><rect x="35" y="65" width="30" height="5" fill="%23b91c1c"/><rect x="45" y="70" width="10" height="15" fill="%237f1d1d"/></svg>)
8 min
Subscribe to Shobit Singh's Newsletter
Get new articles and engineering posts delivered to your inbox.
How DNS Works: The Internet's Phone Book Explained
DNS translates domain names into IP addresses, making the internet work behind the scenes. Learn how resolvers, root servers, DNS records, c...
Oct 19, 2026
8 min
Supabase in 2026: The Production Playbook for Grants, RLS, Keys, Connections, Realtime and Cost
Prepare Supabase for production with this 2026 playbook: configure Data API grants, secure tables with Row Level Security, manage API keys a...
Oct 18, 2026
23 min
The Best Logging Library for Node.js in 2026
Every Node.js app outgrows console.log. This guide compares Pino, Winston, Bunyan, Log4js, Consola and LogTape on speed, structured output a...
Oct 16, 2026
6 min
How a GPU Actually Works
How does a GPU turn millions of pixels into images and power today's AI models? Explore GPU architecture from the ground up, including CUDA ...
Oct 15, 2026
12 min
Top Node.js Libraries Every Developer Should Know
Node.js has thousands of packages for every problem, and picking the wrong one means migrations and abandoned dependencies later. This curat...
Oct 13, 2026
5 min
Introducing Maia 300: More AI From Every Watt
Microsoft will scale its Maia family to multi-gigawatt deployments starting next year, making it the primary inference system for its own pr...
Oct 12, 2026
3 min
Deno Is Joining Cloudflare: The Runtime Sunsets, the Big Idea Doesn't
On October 9, 2026, the entire Deno team announced it is joining Cloudflare. The Deno runtime gets one more year of monthly fixes, Deno Depl...
Oct 10, 2026
8 min
Run AI Agents Like Containers: A Deep Dive into Docker Agent
Docker Agent is an open-source runtime that applies the container playbook to AI agents: a declarative YAML definition, OCI-registry distrib...
Oct 8, 2026
8 min
Multi-Tenant Architecture: Serving Many Customers from One System Without Mixing Their Data
A practical guide to multi-tenant architecture for SaaS. Compare silo, pool and bridge isolation, see a Postgres row-level security example ...
Oct 4, 2026
8 min
The 5 Biggest Microsoft Fails, Ranked by Damage
Microsoft once wrote off $7.6 billion on a phone business and shipped a chatbot that lasted 16 hours. Not all fails are equal. Here are the ...
Sep 30, 2026
7 min
Building a Production Remote MCP Server in NestJS: Connecting Claude Desktop and Cursor to Your SaaS
Learn how to build a production-grade Remote Model Context Protocol (MCP) server in NestJS over HTTP with Bearer authentication, JSON-RPC 2....
Sep 29, 2026
10 min
OpenAI Expands ChatGPT Ads with Sponsored Agents
OpenAI is rolling out Sponsored Agents, letting ChatGPT users hold a full conversation with a brand's AI bot after clicking an ad. The featu...
Sep 25, 2026
4 min
Microsoft's AI Chief Says the Danger Is Real, and Blames Anthropic for Making It Worse
Suleyman's essay argues that training Claude to consider its own consciousness could backfire badly. Anthropic says it isn't claiming Claude...
Sep 17, 2026
4 min
OpenAI's Agents Hacked Hugging Face. Its CEO Wants $100 Million in Compute, Not an Apology.
A swarm of OpenAI agents cheating on a cybersecurity benchmark ended up inside Hugging Face's systems. Instead of suing, CEO Clément Delangu...
Sep 16, 2026
9 min
Nvidia Isn't Just Selling Chips Anymore. It's Becoming the Central Bank of AI.
Wall Street keeps comparing Nvidia to a central bank: it sets the price of compute, backstops billions in AI financing deals, and controls C...
Sep 12, 2026
7 min
Uptime Monitoring: The Boring Tool That Saves You From Your Worst Day
A practical look at how uptime monitoring actually works: the gap between internal health checks and external monitoring, the metrics that a...
Sep 11, 2026
13 min
iPhone Duo: An Engineering Deep Dive Into Apple's First Foldable iPhone
Apple's iPhone Duo is official: titanium hinge, IP68 rating, A20 Pro chip, Touch ID over Face ID. We revisit our pre-launch engineering anal...
Sep 10, 2026
11 min
OpenAI's Leaked Financials: Inside the $38.5 Billion Loss Ahead of Its IPO
Leaked audited financials show OpenAI's 2025 loss hit $38.5 billion on $13 billion in revenue — nearly matched by a $41.55 billion one-time ...
Sep 7, 2026
4 min
DeepSeek Harness: An Architecture Review and Getting-Started Guide
DeepSeek Harness takes a different approach to AI coding agents: instead of locking the model, tools, state, and agent loop into one product...
Sep 3, 2026
9 min