Build and check a transactional email flow

How these skills work together

Define the message and recipient context, build a React Email template and inspect its rendered HTML. Implement a narrow Resend flow with securely configured credentials, idempotent retries and signature-checked webhook handling. Use controlled test recipients before any separately authorized production send.

Validation and boundaries

Test long content, image blocking, links and client rendering as well as duplicate events, bounces and retries. Provider acceptance is not inbox delivery. Account permissions, quota, costs and recipient consent require separate checks; this kit does not send email or change the site publication policy.