DNS & NetworkingbeginnerJul 10, 20267 min read
MX Records Demystified: What Happens When You Hit Send
A no-fluff walkthrough of MX records, email routing, priority levels, and the stuff that breaks when you get it wrong.
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DNS, email authentication, and network infrastructure guides written by engineers who work with this stuff every day. No fluff, no filler.
Email AuthenticationintermediateJul 12, 20269 min read
DKIM: The Crypto Behind Email Authentication That Actually Works
How DKIM uses public-key cryptography to sign your emails, why it survives forwarding when SPF doesn't, and how to set it up without pulling your hair out.
DNS & NetworkingbeginnerJul 14, 20266 min read
DNS Propagation Is a Lie: What's Actually Happening When You Change a Record
DNS changes don't propagate. They expire. Here's how TTL, caching, and resolver behavior actually work, and how to check your changes globally.
Email AuthenticationintermediateJul 16, 20268 min read
SPF Optimization: How to Stay Under the 10-Lookup Limit Without Dropping Providers
Every include adds a lookup. Go past 10 and your email gets rejected. Here's how to audit, compress, and optimize your SPF record without sacrificing coverage.
Email AuthenticationadvancedJul 18, 202610 min read
DMARC: The Slow Burn From p=none to p=reject Without Breaking Anything
How to implement DMARC in phases, read the XML reports, find all your legitimate senders, and lock down your domain so nobody can spoof it.