Resend modernises transactional email with a developer-friendly API and React Email for template authoring. Test your knowledge of Resend's core features and best practices.
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What is React Email and how does it integrate with Resend?
React Email lets you write email templates as React components using email-safe JSX elements (<Html>, <Text>, <Button>). You render them to HTML strings with render() and pass the output to Resend's emails.send(). This replaces hand-writing HTML tables with a component-based developer experience.
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How do you send a batch of emails with the Resend API?
resend.batch.send() accepts an array of email objects and sends them all in one HTTP request to Resend's batch endpoint. This is more efficient than looping over individual send() calls and avoids rate limiting issues when sending to many recipients simultaneously.
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Why is domain verification important when using Resend?
Domain verification requires adding DNS records (SPF, DKIM, DMARC) to prove you own the sending domain. Without these records, receiving mail servers treat your emails as suspicious — leading to spam folder placement or outright rejection. Resend guides you through adding these records to achieve high deliverability.
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What are Resend webhooks used for?
Resend webhooks POST event payloads to your endpoint when email events occur — delivery confirmations, bounces, spam complaints, link clicks, or opens. This lets your application react to delivery failures (e.g., remove a bounced address) or track engagement without polling the Resend API.
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In a Next.js API route, what does the following code do: await resend.emails.send({ from: 'noreply@example.com', to: user.email, subject: 'Welcome', react: <WelcomeEmail name={user.name} /> })?
Resend's SDK accepts a react prop directly — you pass a React element and Resend renders it to HTML internally using React Email's render() before sending. This means you don't need to call render() yourself; the SDK handles JSX-to-HTML conversion as part of the send() call.