Why is email open (no central owner)?

Email has no central owner because it's built on public standards called RFCs (Request for Comments). These are freely available documents that describe exactly how email works: how messages are formatted, how servers talk to each other, how authentication should function.

Anyone can read these RFCs and build a mail server that speaks the same language. That's why Gmail can send to Fastmail, which can send to your company's self-hosted server. No permission needed, no licensing fees, no central authority deciding who gets to participate.

It's like the Rules of the Sea. Ships from different countries, flying different flags, can navigate the same waters because they all follow agreed-upon maritime law. No single nation owns the ocean or controls who can sail. Email works the same way: open infrastructure, governed by cooperation rather than control.

Why this matters for senders: The openness is both email's superpower and its Achilles' heel. On one hand, you're not locked into a single platform. You can switch ESPs, run your own mail server, or use multiple providers without losing the ability to reach your subscribers. On the other hand, because anyone can send email, spam exists. And that's why authentication protocols like SPF exist: to prove you're a legitimate sender in an open system where anyone can claim to be anyone.

The contrast with closed platforms is stark. SMS is controlled by telecom carriers. WhatsApp is owned by Meta. Slack channels only work inside Slack. If those companies change their policies, raise their prices, or shut down, you're stuck. Email? It outlasts them all because no single entity can kill it.

The practical consequence: your deliverability isn't just about your own reputation. It's about proving you're playing by the shared rules. Authenticate your domain, respect RFC standards, follow best practices. In an open system, trust is earned through technical proof, not corporate guarantees.