Paul O'Brien (CBCI) works in Corporate Resilience and writes about email privacy, infrastructure, and software systems. He delivers independent technical teardowns and practical guides to owning your digital footprint.
SPF lists which servers may send email for your domain, but it checks the delivery path, not the sender people see. This guide covers record syntax, ~all vs -all, the 10-lookup limit and why legitimate mail fails.
Email was built on trust, so the From line can be faked. This guide explains how SPF, DKIM and DMARC work together, adds MX, MTA-STS and BIMI, and points to the detailed guide for each.
Email mistakes at work are common — but when do they lead to discipline? Here’s how employers judge intent, risk, and impact.
Privacy rarely fails through dramatic hacks. It erodes quietly as the same email address is reused across accounts, services, and years of digital life — turning a simple inbox into an identity anchor.
Spam hasn’t disappeared — it has adapted. From mass junk to quiet impersonation, modern spam blends into routine digital life.
Zero-access encryption stops your provider reading stored mail, but not metadata or inbound mail before it arrives. Here is what it covers, how it differs from end-to-end, and the trade-offs.
An address on your own domain stays yours when you change provider. This guide covers what it costs, which providers support custom domains, how to move without losing mail and how to protect the domain.
DKIM signs your email so receivers can check it wasn't altered, but it proves integrity, not identity. This guide covers signatures, selectors, key length, provider setup and why genuine mail fails.
