Resend
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Resend brings a modern developer experience to email, with first-class support for React components. You write email templates as JSX, preview them in real time, and send via a clean API. The free tier provides 3000 emails per month, and since the company behind it focuses on developer ergonomics, the docs and error messages are unusually thoughtful.
Resend appeals to React and Next.js shops that want to treat email as code and version it alongside the app. If your team already builds in React and prefers components over templates, Resend's tight integration pays off; it's overkill if you just need to fire off plain-text transaction emails.