Resend

The email API for developers: React Email templates, delivery webhooks and a dashboard that explains every bounce.

Resend is the email API built by the team behind React Email: a small, modern sending API with first-class templates as React components, webhooks for delivery events, and a dashboard that shows exactly what happened to every message. It targets developers who find legacy ESPs exhausting.

Why founders use it: transactional email is infrastructure until it breaks, and Resend makes the common path short: verify a domain, send with an API key, get delivery webhooks, debug failures in a clean log. React Email templates mean the same component system styles your emails and your app, with previews in development instead of sending test messages to yourself.

A realistic setup: domain verified with DKIM and SPF, transactional sends for signup, password reset and receipts, broadcast audiences for product updates, and webhooks writing delivery and bounce events into your database. Add a fallback provider for critical paths if volume matters.

Trade-offs: younger than the incumbents and priced per message at scale, which matters for high-volume senders; Amazon SES remains cheaper at volume. Deliverability is shared responsibility: warm the domain, honor bounces, and keep a plain-text path. Compare with Postmark for deliverability-first positioning and Loops for marketing-plus-transactional in one product.