Resend

When Resend is the right answer

Transactional email is the unsexy plumbing every product needs: welcome emails, password resets, receipts, magic links, notification messages. The category has historically been served by SendGrid, Mailgun, Postmark, and Amazon SES. All functional, all aged.

Resend is the modern entrant. The API is what you would design today: typed SDKs for every major language, JSON in JSON out, webhooks for delivery events. The default integration is React Email, which means your transactional templates can be real React components shared with the rest of your codebase.

For a one-person business shipping a SaaS or digital product, that DX matters. The half-day you would have spent fighting SendGrid templates becomes thirty minutes of writing JSX.

What you actually use

• Send emails via API. One POST request, deliveries confirmed, webhooks fire on opens/clicks/bounces.
• React Email templates. Build email templates as React components with a sensible subset of CSS that actually works in Outlook. Preview in the dashboard, send via API.
• Domain authentication. Add a TXT record, click verify, you are done. The flow walks you through DNS setup more clearly than any competitor.
• Webhooks. Subscribe to delivery events (sent, delivered, bounced, complained, opened, clicked) and update your app accordingly.

Where Resend is still growing

The marketing-email side of Resend is newer. They have started shipping audiences and broadcasts, but for a real newsletter or marketing send, dedicated ESPs (Beehiiv, Kit) are still the better tool. Resend is at its best for one-to-one product emails.

The template editor is intentionally minimal. Resend's view is that you bring React Email or your own renderer, not that they build a drag-and-drop editor. If you want a no-code template builder, this is not the tool.

The track record is shorter than SendGrid or Postmark. Deliverability has been good in independent tests, but a tool launched in 2023 has fewer years of "it just works at 1M emails/day" history than Postmark.

Alternatives

• Postmark: longer track record, more conservative API. Still a good choice if you prefer maturity over newness.
• Amazon SES: cheapest at scale, harshest DX. Worth it past 1M emails/mo, painful below.
• SendGrid: legacy choice, owned by Twilio. Functional but DX has not aged well.

Verdict

For modern stacks shipping transactional email, Resend is the easiest on-ramp in 2026. The free tier (3k/mo) is enough for early product validation, the Pro tier ($20/mo for 50k) is reasonable. If your stack is React-shaped, the React Email integration is a real productivity win.