Resend, a company that powers millions of transactional and marketing emails per day, has raised $18M in Series A funding led by Andreessen Horowitz. The company exists to make human communication easier through the internet and email protocols. With over 200,000 developers signed up and an open-source project React Email crossing 300,000 weekly downloads, Resend is poised for continued growth. The team plans to double down on building a developer experience that prioritizes reliability, product development, and support, with investments in infrastructure, new features, and customer success initiatives.