Resend

The platform provides an HTTP‑based API that lets developers send transactional and marketing emails without operating their own SMTP infrastructure. By making simple POST requests to endpoints such as /emails/send, callers receive a JSON response containing an email identifier, and the service handles delivery, bounce handling, and link‑click tracking automatically. SDKs are available for many languages—including Node.js, Python, Ruby, PHP, Go, Java, and .NET—so integration can be done with a few lines of code.

A test mode allows developers to simulate sends and webhook events without delivering real messages, reducing the risk of accidental spam. Real‑time webhooks can be configured to notify a server when an email is delivered, opened, bounced, or when a link is clicked, enabling downstream processing or analytics. The web interface includes a visual editor for composing HTML emails, with options to apply custom styles and preview the result.

Contact management features let users group and organize recipients, while built‑in analytics summarize delivery metrics, opens, clicks, and complaints. The service is positioned for developers who need a reliable, programmatic way to send email at scale, offering a straightforward API, language‑specific libraries, and tooling for testing and monitoring.