Title: Billion Dollar Baby: The Email API That a16z, Figma, and Supabase All Bet On Category: ai Excerpt: Email is 50 years old. Every serious provider was built around 2009, acquired, and forgotten. Then Zeno Rocha built Resend — and made something that should have always been this simple. I've never respected anything more. ---

Billion Dollar Baby: The Email API That a16z, Figma, and Supabase All Bet On

I have a specific kind of respect that I don't give easily. Not for people who build complicated things. Anyone can build something complicated — you just keep adding layers until nobody understands what's happening, including you. The respect I'm talking about is for the people who look at something genuinely difficult, something that has defeated smart engineers for years, and figure out how to make it feel obvious. Zeno Rocha did that with email.

The thing nobody admits about email

Email is fifty years old. It is also, quietly, the most important communication infrastructure in the world. Not the most exciting. Not the most discussed. The most important. Every app you use sends you email. Every account you create is confirmed by email. Every transaction, every password reset, every notification that matters — email. And for most of the past decade, the tools developers used to send that email were built by companies founded around 2009, acquired by someone else, and left to slowly calcify while their new owners optimised for enterprise sales contracts rather than the experience of the developer sitting at a keyboard at midnight trying to make a transactional email work. I know that experience. Building FreeMalta means building a system that sends email — authentication flows, notifications, partner confirmations. I looked at the major providers. The documentation was written by people who had stopped caring whether anyone could follow it. The interfaces looked like they had been designed by committee in 2011 and never touched since. The APIs required configuration steps that made me feel like I was assembling flat-pack furniture with instructions translated from a language that doesn't have a word for "obvious." I don't like complicated things. I want to be direct about that. I am not someone who enjoys complexity for its own sake. What I respect — deeply, genuinely — is people who take something that has been unnecessarily complicated for years and make it feel like it should have always been this way.

Resend

"I feel like email is the most underrated technology in the world. When you look at all the biggest players, you'll notice that they were all founded around 2009/2010, and they all have been acquired by now. Because of that, it's common to see them only prioritizing enterprise requirements and optimizing for sales-led growth." Zeno Rocha said that. He's the co-founder and CEO of Resend, a Brazilian developer who built the thing he wanted to exist because nothing that existed was good enough. The interface is clean. The documentation assumes you are intelligent without assuming you already know everything. The API is what an API should be — a thing you integrate once, correctly, and then don't think about again because it works. React Email — the open-source library Resend built alongside the core product — lets you write email templates in React. Not in raw HTML tables that belong in 2003. In the same language you use for everything else. It grew to 1.4 million weekly npm downloads with 15,000 GitHub stars and 130 contributors. That last number matters: 130 people improving your email template library because they found it useful enough to contribute to. That is not marketing. That is trust, accumulated slowly, through a product that deserved it.

The numbers that followed

Revenue trajectory: $1.4M in 2023. $5M in 2024. $25M in 2025 — 400% year-over-year growth. 1 million users by December 2025, reached in 30 months. 25 employees. $1 million revenue per employee. I want to sit with that last number for a moment. Twenty-five people. $25 million in annual recurring revenue. One million dollars per person. Most companies with twenty-five employees are burning cash and hoping the next funding round arrives before the runway ends. Resend, with twenty-five people, is profitable, growing at 400%, and has Warner Bros and Decathlon as customers. The seed round came from Dylan Field (Figma), Guillermo Rauch (Vercel), and Paul Copplestone (Supabase). Andreessen Horowitz led the $18M Series A in December 2024, with Mailchimp's former CTO participating. Paul Copplestone — who built Supabase, which FreeMalta runs on, which I wrote about separately because it deserves its own piece — invested in Resend. The founder of the tool I use to store data bet on the founder of the tool I use to send email. Developer infrastructure is a small world. The people building the layers underneath everything else tend to recognise each other.

What this is really about

There is a version of this article that is all benchmarks and market analysis and total addressable market calculations. I am not going to write that version. What Resend represents is simpler than that. It is the proof that there is always room for the person who looks at something broken and decides to fix it properly rather than work around it. Email infrastructure was broken — not technically, but experientially. The tools existed. The protocols worked. The experience of building with those tools was unnecessarily, inexcusably bad. Zeno Rocha fixed it. He didn't invent a new protocol. He didn't build something that had never existed. He built something familiar that felt, finally, like it respected the person using it. I have a specific kind of respect that I don't give easily. He has it. --- FreeMalta uses Brevo for email marketing and Resend for transactional infrastructure — two different tools for two different jobs. The Content & Social page covers Brevo and the rest of the distribution stack. The Off The Record library is where the rest of this thinking lives.