Transactional Email in Next.js with Resend
Every SaaS sends email — welcome messages, receipts, password resets, login links. Resend has become a favorite for Next.js apps because it's simple and lets you write templates in React.
Why transactional email is different
Transactional emails are triggered by a user action and expected within seconds — a receipt, a magic link, a notification. They must reliably reach the inbox, which makes deliverability more important than design.
Setup and templates
Send from a server action or route handler so your API key stays secret. With React Email you write templates as components, preview them locally, and reuse your design tokens — far nicer than hand-writing HTML tables.
Deliverability essentials
- Verify your domain and set up SPF, DKIM, and DMARC records.
- Send from a real subdomain (like mail.yourapp.com), not a free provider.
- Keep transactional and marketing email separate so complaints don't hurt critical mail.
- Include a plain-text version and a clear sender name.
The emails to build first
Prioritize the ones tied to core flows: account verification / magic link, purchase receipt and license delivery, and password reset. Add welcome and re-engagement emails once the essentials are solid.
KitCraft templates include Resend-powered transactional email — verification, receipts, and license delivery — with React templates you can restyle to match your brand.