Paul O'Brien

Paul O'Brien

Paul O'Brien writes about software, digital resilience, and business continuity. Technical background, pragmatic perspective—exploring the operational trade-offs between convenience, privacy, and control.

62 posts

Your Email Is Your Weakest Privacy Link

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.

Why Using Your Own Email Domain Makes Sense

Email addresses tend to outlive the services behind them. This piece explores why using your own domain for email reduces lock-in, ages better than free inboxes, and gives you long-term control over an identity most people never think to own.

DKIM Proves Message Integrity — Not Sender Identity

DKIM (DomainKeys Identified Mail) doesn’t verify who sent an email. It verifies that the message hasn’t been altered since it was signed, and that a domain takes responsibility for its contents. Understanding DKIM means understanding what it proves — and what it deliberately ignores.

Free vs. Paid Email: What You Really Pay With

Free email feels effortless, but the real cost often shows up later. This piece explores the hidden trade-offs between free and paid email — from incentives and lock-in to control, privacy, and long-term trust.